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 raised in three ways:
1. By increasing the number of turns in the coil.
- By boosting the current via the electromagnet’s coil.
- By shortening the air gap between the electromagnet’s poles.
(d) If a coil is viewed from one end and the current flows in an anticlockwise direction, then this end is a north pole.
Explanation:
The clock rule determines the coil’s polarity. If we face one end of the coil and the current travels counterclockwise, we get the North Pole and the South Pole.