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Q.

Two bar magnets of the same mass, same length and breadth but having magnetic moments M and 2M are joined together pole to pole and suspended by a string. The time period of assembly in a magnetic field of strength H is 3 seconds. If now the polarity of one of the magnets is reversed and the combination is again made to oscillate in the same field, the time of oscillation is

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a

6 sec

b

 3 sec

c

33  sec

d

3  sec

answer is B.

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Detailed Solution

first case effective moment is 3M. Second case it is M and time period  T∝1M

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