Statement I A magnet is dropped along the axis of a circular conducting loop as shown in figure. Then, the acceleration of magnet is always more than g.  |
| Statement II According to Lenz's law, the direction of magnetic field induction effect is such as to oppose the cause of the effect. |
A) Both Statement I and Statement II are true and the Statement II is the correct explanation of the Statement I
B) Both Statement I and Statement II are true but the Statement II is not the correct explanation of the Statement I
C) Statement I is false but Statement II is true
D) Both Statement I and Statement II are false
Correct Answer: C
Solution :
Idea It is based on Lenz's law and motion under gravity. If we apply Lenz's law, initially current will flow in counter clockwise direction, as flux is increasing. So upper face of ring will act as North Pole. So ring will repel the magnet. When magnet is releasing, then the current will flow in clockwise direction as flux now is decreasing. So lower face will act as North Pole which would attract the South Pole of magnet. So, acceleration of magnet shall always be less than g. TEST Edge Another questions where the direction of induced current are asked can be solved by Lenz's law.
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