| Assertion (A): If the number of turns of a coil is increased, it becomes more difficult to push a bar magnet towards the coil. |
| Reason (R): The difficulty faced is according to Lenz's law. |
A) Both A and R are true and R is the correct explanation of A
B) Both A and R are true but R is NOT the correct explanation of A
C) A is true but R is false
D) A is false and R is true
Correct Answer: A
Solution :
| Option [a] is correct. |
| Explanation: As it is-tried to push a bar magnet towards a coil, magnetic flux increases. According to Faraday's law induced e.m.f. is generated. As the number of turns increases, induced e.m.f. increases. |
| According to Lenz's law, Induced e.m.f. always opposes the change in magnetic flux that causes the induction of e.m.f. So, the induced e.m.f. will oppose the motion of the bar magnet towards the coil. As the number of turns increases, opposition increases. Hence both assertion and reason are true and the reason explains the assertion properly. |
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