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A magnetic needle is made to vibrate in ...

A magnetic needle is made to vibrate in uniform field `H`, then its time period is `T`. If it vibrates in the field of intensity `4H`, its time period will be

A

2T

B

T/2

C

2/T

D

T

Text Solution

Verified by Experts

The correct Answer is:
B
`T prop (1)/(sqrtH)`
`rArr (T_(1))/(T_(2)) = sqrt((H_(2))/(H_(1))) rArr (T_(1))/(T_(2))= 2 rArr T_(2)= (T_(1))/(2) = (T)/(2)`
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