Answer: The joule/coulomb is also known as volt. The SI unit of electric potential is the volt. The potential difference between two points of a current-carrying wire of 1 ampere is represented by...

Answer: The correct option is c) anticlockwise The front face of the circular wire (or coil) is the South pole if the current flows clockwise around it (S-pole). The current flow in the circular...

Answer: The correct option is c) parallel to the axis of the tube Explanation: The magnetic field lines inside a current-carrying solenoid are parallel to the tube's axis.

Answer: The correct option is b) will increase Explanation: To boost the magnetic field within a current-carrying solenoid, insert a soft iron bar. The iron bar gains magnetic properties when...

Answer: The correct option is c) Oersted Explanation: Hans Christian Oersted discovered the magnetic effect of electricity in 1820. He showed the effect by observing the deflection of a long...

Answer: The correct option is a) soft iron Explanation: When creating the core of an electromagnet, soft iron is preferred over hard iron because the core is employed in a solenoid to generate the...

Answer: The correct option is c) north pole Explanation: Using the clock face rule, we found that if the flow of electric current in a solenoid is anticlockwise, that end is the north pole. Both a...

Answer: The correct option is c) south pole Explanation: An electromagnet is a current-carrying coil that might be regarded to be inductive. To determine which end of the electromagnet will behave...

Answer: The correct option is c) Clock face rule Explanation: Option c is the best choice. This rule is more straightforward than other rules because it only requires that you glance at the coil...

Answer: The correct option is d) the field consists of concentric circles centered on the wire Explanation: In magnetism and electricity, a straight wire or conductor forms concentric magnetic...

Answer: option d) A long straight solenoid's magnetic field is constant. The magnetic field in the solenoid is constant since the lines are parallel.

Answer: The correct option is b) direction of current in electromagnet were reversed. Answer: The electromagnetic winding's current direction is reversed only on one side of the pole. The magnetic...

Answer: The correct option is c) producing induced current in a coil due to relative motion between a magnet and the coil Explanation: According to Faraday's Law of electromagnetic induction, a...

Answer: The correct answer is d) vertically upwards Explanation: Using Fleming's left-hand rule, the wire's force acts vertically upward. The index finger indicates the direction of the magnetic...

Answer: The correct option is c) a stationary electric charge Explanation: The magnetic field is the area around a magnet where the magnetic force is delivered. The magnetic field lines can be...

Answer: The correct option is a) mechanical energy to electrical energy Explanation: A motor is a machine that turns electrical energy into mechanical energy. Electricity into mechanical energy in a...

Answer: The correct option is c) vertically downwards Explanation: Using Fleming's left-hand rule, the force on the wire should be vertical. The index finger indicates the direction of the magnetic...

Answer: The correct option is c) 180⸰ The wire is at an angle of 180° to the magnetic field. Force is felt by a current-carrying wire in a magnetic field. Using the formula F = BILsinθ ———–(1) where...

Answer: The correct option is c) 90⸰ Explanation: A current-carrying conductor feels the most force when the magnetic field and current are perpendiculars.

Answer: The correct option is c) into the page Explanation: Using Fleming's left-hand rule, the electron beam will be forced into the paper. The index finger indicates the direction of the magnetic...

Answer: The correct option is b) 50 Hz Explanation: In India, only 220-250 volts and 50 Hz are allowed. Because the high frequency in India can completely heat up the electrical wire.

Answer: The correct option is a) 0 Hz Explanation:The DC frequency is 0 since the current flow is unidirectional. Direct current (DC) has no chance of reversing direction, and its frequency is...

Answer: The correct option is b) Explanation: The induced emf is represented by: e=-NAd(B)dt e=-N A \frac{d(B)}{d t} Here, $N$ is the number of turns of the coil, $A$ is the area of the coil, and...

Answer: The correct option is b) electromagnetic induction Explanation: On the basis of electromagnetic induction, d.c. generators produce an electromotive force when the flux across the generator...

Answer: The correct option is d) Explanation: Any equipment that turns mechanical energy into electricity for transmission and distribution to residential, commercial, and industrial clients....

Answer: The correct option is d) moving out of the solenoid Explanation: The galvanometer displays no deflection when the bar magnet is fixed. A galvanometer shows deflection when the north pole of...

Answer: The correct option is c) increasing the size of the gap in which the armature turns

Answer: The correct option is a) return to zero Explanation: When the switch S is closed, the galvanometer's pointer moves to the right. If S is closed, the magnetic field becomes constant, meaning...

Answer: The correct option is d) AC generator has slip rings while the DC generator has a commutator Explanation: So, the main distinction between AC and DC generators is that AC generators have...

Answer: The correct option is a) generator Explanation: A Generator is a device that produces an electrical current. Derived from a dynamo. A generator turns mechanical energy into electrical...

Answer: The correct option is c) producing induced current in a coil due to relative motion between a magnet and the coil Explanation: According to Faraday's Law of electromagnetic induction, a...

Answer: The correct option is c) half revolution Explanation: As we know that E.M.F is given by: E=nωBAcosωt On every half-rotation, the direction of the induced current changes. As a result, the...

Answer: The correct option is c) magnetic effect of current. Explanation: A micro circuit breaker (MCB) works faster and more efficiently than a fuse to stop excessive current flow. When heated, an...

Answer: The correct option is d) MCB In place of fuses, MCBs are utilised in home wiring. When the current is high enough, the MCB's electromagnet separates the contacts and breaks the circuit.

Answer: Option (d) 2A is the most adequate answer. Explanation: Power P is equal to 240 watts. V = 240V is the voltage. We already know that power equals voltage times current. Maximum current drawn...

Answer: The correct option is b) a 13A fuse is the most appropriate value to use Explanation: Describing the relationship between the fuse rating and the fuse rating. FR=1.25×PV F R=1.25 \times...

Answer: The correct option is a) 5A We need a fuse with a current capacity somewhat higher than the device's maximum. According to the stated choice, the correct circuit fuse is 5 A, which is...

Answer: The correct option is b) switches, fuses, and circuit breakers should be placed in the neutral wire They should not be attached to the neutral wire because if they are, they would all burn...

Answer: The correct option is b) 5A Explanation: In regular use, a hair dryer draws 3.5 A. 1 to 1.5 are considered safe. So, for 4.2 A, the 5A fuse is safe.

Answer: The correct option is d) 30 Explanation Let n be the number of parallel tube lights that can be safely run. It is given that: Power of one tube-light, $P =40 W$ Therefore, Power of $n$...

Answer: The correct option is c) 10A Explanation: We need a fuse with a current capacity somewhat higher than the devices. So, 10 A is a little more than the device's current draw of 5.68 A.

Answer: The correct option is c) increases heavily Explanation: Because a short circuit increases the circuit's current, option c is the correct answer. A short circuit is an electrical circuit that...

Answer: e) It is not recommended to operate electric switches while the hands are wet, due to the fact that water is a good conductor of electricity, and we could receive an electric shock.

Answer: c) The following are the most critical safety precautions that should be followed at all times: i)  Making use of high-quality cables ii) The use of proper earthing is also important. iii)...

Answer: a) For example, fuses installed in a residential electricity supply's fuse box protect the wiring of the house from an excessive current flow in the circuit. b) A fuse is a device that...

Answer: a) Given, P = 3kW = 3000W V = 240V As we know that, P = VI I = P/V Evaluating the value of current, I = 3000/240 I = 12.5A b) The size of the fuse that should be used in the geyser circuit...

Answer: To avoid lethal electric shocks, electrical gadgets have iron bodies. When the live wire touches the metallic case, a tremendous quantity of electricity passes through the user's body....

Solution: a) Given, V = 230V P = 750W T = 30/60 = 0.5 hours i) Let the maximum current be I As we know that, P = VI Evaluating value of current, 750 = 230I I = 3.26A ii) Electric energy consumed, E...

Answer: a) As previously said, a fuse is considered to be one of the most significant devices that are used for protection in order to avoid the damages that can occur as a result of either an...

Answer: a) When the current exceeds the safe limits, the fuse wire melts and breaks the circuit. This is called a fuse turned off. b) Given, V = 220V I = 5A Let the maximum number of bulbs be y...

Answer: A short circuit occurs when the live wire comes into touch with the neutral wire, which is a dangerous situation. It is known as overloading when more than two electrical appliances with a...

Answer: a) Fuse wire is made of tin-plated copper, which has a low melting point. b) Pure copper has a high melting point, making it harder to melt during short circuits.

Answer: a) Live b) Body. Explanation: a) If the fuse is linked to a neutral wire rather than a live wire, and the fuse blows, the appliances remain connected to the live wire and the current...

Answer: The parallel connection should be used to connect all of the bulbs in a structure.

Answer: Two reasons exist for connecting electrical appliances in parallel in a household circuit: a) When connected in parallel, when one stops working, the others continue to work. b) All...

Answer: Generally speaking, the primary goal of earthing electrical equipment is to reduce the possibility of electric shocks.

Answer: a) Red is the colour of live wire b) Black wire is used for the neutral wire. c) The green earth wire serves as the grounding line.

Answer: Following are the three colours that are used in an electric appliances: a) Red b) Black c) Green

Answer: To safeguard the circuit from overcurrent, fuses are always connected in series. A blown fuse will open the circuit and stop the flow of current.

Answer: Live wire Switches are installed in the live wire to allow an electrical device to be turned off and on. Switches are used to connect an electrical device to the main power supply. As long...

Answer: In order for a short circuit to occur, the live wire and the neutral wire must come into direct contact with one another.

Solution: Given, P = 180W V = 240V As we know that, P = VI Thus, evaluating the value of I I = P/V = 180/240 = 0.75 A Because of this, the fuse wire should be capable of withstanding currents up to...

Answer: The electric potential of the neutral wire in a mains supply cable is zero volts. In an AC circuit, the neutral wire serves as a return path for the passage of electricity. The neutral wire...

Answer: The three wires of the cable that connects to the plug of an electric iron are colored as follows: red, black, and blue. a) Red wire: This is a live wire. b) The black wire is the neutral...

Answer: The earth wire, which is used in conjunction with the live wire and neutral wire, is the third wire that is employed.

Answer: a) False Explanation The electric power line enters our house via three wires: live, neutral, and earth. The first two transport electricity from the power plant, while the third is earthed...

Answer: Following is the usual capacity of an electric fuse that is used in: a) 5A b) 15A It is a stated fact.

Answer: The term "electric fuse" refers to the device that is used to automatically switch off the electricity supply when a short circuit occurs in the domestic wiring.

Answer: a) As a general rule, direct current is used to refer to the current that flows in just one direction, and alternating current is used to refer to the current that flows in both directions...

a) When it comes to the building of both the DC and the AC generators, the ends of both generator coils are connected to the outer circuit. A DC generator is comprised of two half rings of copper...

Answer: a) Fleming's right-hand rule: The thumb, forefinger, and middle finger of the right hand are parallel. The thumb indicates conductor velocity, the forefinger the magnetic field, and the...

Answer: The direction of induced current in a magnetic field is given by Fleming's right-hand rule. The right thumb, forefinger, and center finger must be held at right angles. The forefinger shows...

Answer: a) i) The distinction between alternating current and direct current is that alternating current can flow in both directions. ii) DC current's value and direction remain constant while AC...

Answer: a) An electric generator works by moving a straight conductor in a magnetic field, causing current to flow. b) Current is induced in a generator's coil in the following ways: i)  Faster coil...

Answer: Because of the shift in the magnetic field caused by the placement of coils B and C in close proximity to each other, the other coil will experience some current induced into it....

Answer: A generator with a commutator produces a direct current.

Answer: The three primary sources of magnetic field generation are as follows: Permanent magnet Electromagnets A conductor that transports current.

Answer: Heat-generating plants, such as thermal power plants, are typically placed near rivers because they require a large and consistent supply of water in order for water to be transformed into...

Answer: To convert an alternating current generator into a direct current generator, the slip rings must be replaced with a commutator.

Answer: An unstable potential difference is produced by an alternating current generator. E.g. A coil of wire moving in a magnetic field is an ac generator. At power plants, alternating current...

Answer: Electromagnetic induction is the term used to describe the phenomena in which current is switched on and off in a coil in order to induce a current in another coil.

Answer: Electromagnetic induction is the term used to describe the phenomena in which a wire moves up and down in a magnetic field in order to generate a current in the wire.

Answer: Among their many functions, the brushes of an electric generator are responsible for transferring electricity from the coil to the load.

Answer: a) True Explanation: A generator produces electricity by rotating a coil in a magnetic field. An electric generator (dynamo) turns mechanical energy into electrical energy. Generators do not...

Answer: To convert an alternating current generator into a direct current generator, the slip rings must be replaced with a commutator.

Answer: At power plants, alternating current generators are used.

Answer: The movement of the wire in relation to the magnet is a necessary condition for the generation of current through electromagnetic induction to occur.

Answer: Fleming's right-hand rule is employed in order to determine the direction of the induced voltage.

Answer: Electromagnetic induction is a phenomenon that is used in the production of electricity by electric generators.

Answer: a) A commutator is used by a direct current generator. b) Slip rings are used by the alternating current generator (AC generator).

Answer: Electric generators are devices that are used to transform mechanical energy into electrical energy. They are also known as power generators.

Answer: a) An electric motor converts electrical energy into mechanical energy. Working: The coil ABCD is horizontal. The current enters the carbon brush P and the half ring X commutator. The coil...

Answer: a) i. As a result of reversing the current, the direction of rotation would be reversed. a) I If the current is reversed, the direction of rotation would be reversed. ii. It should be noted...

Answer: a) The current to the coil in a DC motor must be reversed twice during each rotation because the coil will not rotate in the opposite direction until the current is reversed twice. b) A...

Answer: The electric motor works on the Fleming left-hand rule. Hold the fingers, middle finger, and thumb of the left hand at right angles. The forefinger shows the magnetic field, the middle...

Answer: Fleming's left hand rule states that the forefinger, the middle finger, and the thumb of the left hand should be held at right angles to one another. The direction of the force operating on...

Answer: (a) The Fleming left-hand rule can be used to find the direction of force applied on a current-carrying conductor. (b) Increasing the current flow in a conductor in a magnetic field...

Answer: (c) An electric motor works by applying force to a current-carrying coil in a magnetic field.

Answer: (a) Fleming's Rule for the motor effect uses the left hand. Using Fleming's left-hand rule, the forefinger (or index finger) represents the magnetic field, the middle finger (or middle...

Answer: An electric motor's split ring function is to reverse the direction of current flow through its coil whenever it moves from its horizontal position to its vertical position during the...

Answer: The carbon brushes of the motor stay fastened to the motor's base, however, the commutator (divided rings) is free to revolve.

Answer: The core of an electric motor's coil is comprised of soft iron, which gives it its flexibility. The soft iron used in the core of an electric motor's coil is used because it improves the...

Answer: Carbon is used in the manufacture of electric motor brushes. It is through two brushes, which are often formed of carbon, that electricity is allowed to flow into the commutator and...

Answer: The commutator in an electric motor has the function of reversing the direction of the current flow through the coil whenever the coil reaches the vertical position during the revolution of...

Answer: The split ring used in an electric motor is also known as a commutator. In an electric motor, a split-ring or commutator has two conducting arcs separated by an insulator. It permits the...

Answer: Commutator A commutator is a device that reverses the direction of current in a motor's coil (or split ring). In an electric motor, a split ring or commutator has two conducting arcs...

Answer: a) current: the direction is indicated by the center finger b) Magnetic field: the forefinger indicates the direction of the magnetic field. c) Force or motion: the thumb indicates the...

Answer: False An electric motor converts electrical energy into mechanical energy.

Answer: The two types of energy that are involved are as follows: a) Electricity as a source of energy b) Mechanical energy

Answer: Electric motor is the device which converts electric energy into mechanical energy.

Answer: An electric bell is a gadget that operates on the magnetic field created by current flow. It is used to make sound by acting as an electromagnet.

Answer: (a) According to Fleming's left-hand rule, the current is represented by the direction of the center finger. b) Fleming's left-hand rule expresses the magnetic field by the direction of the...

Answer: When a current-carrying conductor is put in a magnetic field, the force experienced by the conductor is at its greatest when the conductor is at right angles to the magnetic field.

Answer: An electrical current-carrying conductor is exposed to a magnetic field, which results in the conductor experiencing a mechanical force, which is responsible for its movement.

Answer: c) Soft iron should be used as the core of an electromagnet rather than steel because soft iron loses its magnetism when there is no electric current flowing through it, whereas steel does...

Answer: a) The term "electromagnet" refers to a temporary magnet that operates when current is supplied through it. In order to construct an electromagnet, a soft iron is used with an insulated...

Answer: e) Electromagnets are used in a variety of electrical equipment, including loudspeakers, electric bells, and electric motors, among others. They are also used by doctors to cure their...

Answer: c) When the magnetic field lines inside a current-carrying solenoid are parallel to one another and in straight lines, the magnetic field inside the solenoid is uniform. d) When employing a...

Answer: e) A core of soft iron should be put inside a current-carrying solenoid to make an electromagnet.

Answer: a) A solenoid is described as a lengthy coil of insulated copper wire that contains a large number of near turns and is used to operate a motor. b) It has been demonstrated that the magnetic...

Answer: a) When compared to a permanent magnet, an electromagnet differs in that an electromagnet may produce a magnetic field as long as the current is running through it, whereas a permanent...

Answer: a. The circuit diagram is An insulated copper wire is twisted around coil C, with the ends of the copper wire being linked to a battery at either end of the coil. As a result, an...

Answer: The strength of a current-carrying solenoid's magnetic field relies on: a) the solenoid's strength is determined by its current. b) The number of turns of the solenoid determines the...

Answer: The clock face rule states that looking at one face of a circular wire when current is flowing is: I) The round wire's face is the south pole when the current runs clockwise around it. ii)...

Answer: a) The diagram of the magnetic lines of force due to a circular wire carrying current. b) Enhance the number of turns of the wire in the coil and the current flowing through it to increase...

Answer: As stated by Maxwell, the corkscrew represents current, while the handle represents magnetic field. This rule is used to find the magnetic field direction around a straight current-carrying...

Answer: According to Maxwell's right-hand thumb rule, when a current-carrying conductor is held in the right hand, the thumb indicates the current direction and the fingers encircling the wire...

Answer: a) The diagram required: b) Maxwell's right hand rule is used to determine the magnetic field direction around a straight current-carrying wire. The thumb points in the direction of the...

Answer: As illustrated in the illustration, a thick insulated copper wire AB runs north-south. Under the copper wire AB is a plotting compass M. A switch connects both ends of the cable to the...

Answer: A plotting compass can be used to locate a current-carrying wire hidden in a wall using the magnetic influence of the current. When the plotting compass is moved across the wall, the needle...

Answer: (e) If a coil is viewed from one end, and the current flows in a clockwise direction, then this end is a south pole. Explanation: The clock face rule determines the coil's polarity. If we...

Answer: (c) The magnetic effect of a coil can be increased by increasing the number of turns increasing the current or inserting an iron core. Explanation: The strength of an electromagnet can be...

Answer: a) The lines of magnetic field round a straight current-carrying conductor are in the shape of concentric circles. Explanation: b) For a current-carrying solenoid, the magnetic field is like...

Answer: Listed below are the three methods by which the strength of an electromagnet can be increased: a) Increasing the number of turns in the coil is one way to accomplish this. The current...

Answer:  A solenoid is the shape of a current-carrying conductor with a magnetic field pattern that is similar to that of a bar magnet.

Answer: True A lengthy circular coil carrying current has a field of parallel straight lines. The figure depicts a similar circumstance. In this case, the right-hand rule is applicable. Imagine a...

Answer: Maxwell's right-hand thumb rule is also known as the corkscrew rule. According to the rule, fingers curl in the direction of magnetic field lines when the thumb of the right-hand points in...

Answer: Concentric circles are formed by the magnetic lines that surround a straight current-carrying conductor.

Answer: Maxwell's right-hand thumb rule is used to determine the direction of a magnetic field created by a straight current-carrying conductor.

Answer: In the case of a current-carrying solenoid, the magnetic field becomes extremely powerful when an iron core is introduced.

Answer: Oersted was the physicist who made the discovery of the magnetic effect of electrical current.

Answer: The observation of a current-carrying wire deflecting a compass needle leads to the conclusion that a magnetic field is produced around the needle.

Answer: A current-carrying wire disguised in a wall can be detected using the magnetic effect of current.

Answer: a) When the north magnetic pole moves, the magnetic field lines move. Magnetic field lines are also called magnetic force lines. Activity: Compass and bar magnet, please. Attach the bar...

Answer: In the presence of an electric current flowing through a wire, it is true that a magnetic field is A magnetic field is created when an electric current flows across a wire. But these...

Answer: Because the resultant force on the north pole is always in one direction, the two magnetic field lines do not cross. The resultant force will be in two directions when the magnetic field...

Answer: When a magnet is present, the magnetic field is defined as the space surrounding the magnet in which the magnetic force is exerted. Using a compass needle, it is possible to detect the...

Answer: The diagram to show magnetic line around the bar magnet is:

Answer: a) North and south b) Bar and south Explanation: A magnetic compass can trace a bar magnet's magnetic field lines. The compass can be moved from one bar magnet pole to another. In order to...

Answer: It is necessary to install magnetic strips in the refrigerator doors in order to keep the door closed.

Answer: Because the needle is exposed to the magnetic field exerted by the bar magnet, when a compass needle is brought close to the bar magnet, it deviates off its course.