Two bar magnets of the same mass, same length and breadth but having magnetic moments M and 3 M are joined together pole for pole and suspended by a string. The time period of assembly in a magnetic f

Question

Two bar magnets of the same mass, same length and breadth but having magnetic moments $M$ and $3 M$ are joined together pole for pole and suspended by a string.
The time period of assembly in a magnetic field of strength $1$ $H$ is $3$ $s$ . 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

TestHub · Accepted Answer

In pole for pole combination, M 1 = 3 M + M = 4 M and if the polarity is reversed M 2 = 3 M − M = 2 M T 2 = ? T 2 T 1 = M 1 M 2 = 4 M 2 M T 2 = 2 T 1 = 3 2 s

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