Two bar magnets of the same masses, lengths and breadths 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 s. If the polarity of one of the magnets is reversed and combination is again made to oscillate in the same field, the time of oscillating is
A
B
C
3 s
D
6 s
Text Solution
Verified by ExpertsThe correct answer is:
B
In sum position, 
In difference position, 
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Magnetic lines of force: