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The force exerted on a current-carrying wire placed in a magnetic field is zero when the angle between the wire and the direction of magnetic field is: a) 45⸰ b) 60⸰ c) 90⸰ d) 180⸰
The force exerted on a current-carrying wire placed in a magnetic field is zero when the angle between the wire and the direction of magnetic field is: a) 45⸰ b) 60⸰ c) 90⸰ d) 180⸰
CBSE | Class 10 | Lakhmir Singh | Magnetic Effects of Electric Current | Physics
The force exerted on a current-carrying wire placed in a magnetic field is zero when the angle between the wire and the direction of magnetic field is: a) 45⸰ b) 60⸰ c) 90⸰ d) 180⸰

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

L = length of the wire
I = The current
θ= The angle between the current direction and the magnetic field
We know that sin 180° is 0.

Substitute the value of sin 180° in the equation (1) we get,

F = BIL × 0 = 0

Therefore, the force exerted on a current-carrying wire that is placed in a magnetic field is zero.

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