Question

A magnet makes 40 oscillations per minute at a place having magnetic field intensity of
0.1 * 10 9 T. At another place, it takes 2.5 sec to complete one vibration. The value of
earth's horizontal field at that place is
IDPMT 1996
1) 0.25 x 10-6 T 2) 0.66 x 10-8 T
3) 0.36 x 106 1
4) 1.2 x 1061​

Answer 1

Answer:

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