A magnet freely suspended in a vibration magnetometer makes 10 oscillations per minute at a place A and 20 oscillations per minute at a place B. If the horizontal component of earth's magnetic field at A is 36 x 10-6 T, then its value at B is
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a
36 x 10-6 T
b
72 x 10-6 T
c
144 x 10-6 T
d
288 x 10-6 T
answer is C.
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Detailed Solution
TATB=BHBBHA⇒60/1060/20=BHB36 x 10-6⇒BHB=144 x 10-6 T
A magnet freely suspended in a vibration magnetometer makes 10 oscillations per minute at a place A and 20 oscillations per minute at a place B. If the horizontal component of earth's magnetic field at A is 36 x 10-6 T, then its value at B is