In place a horizontal component of earth's field is BH. The time period of vibration of a magnet is T. If we take it to a place where earth's horizontal component is BH/2, then the time period will be :
A
T
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B
T2
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C
T√2
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D
2T
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Solution
The correct option is CT√2
Time period of vibration of magnet ; T = 2π√ImBH ... (1)
I ⇒ moment of inertia of magnet about axis of oscillation.
m ⇒ magnetic moment.
BH⇒ horizontal component of earth's magnetic freed.