Two bar magnets of the same mass same length
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Two bar magnets of the same mass, same length and breadth but having magnetic moments M and 2M are joined together pole for 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 combination is again made to oscillate in the same field, the time of oscillation is(a) √3 sec(b) 3√3 sec(c) 3 sec(d) 6 sec