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Question

A magnet is suspended in such a way that it oscillates in the horizontal plane. It makes 20 oscillations per minute at a place where dip angle is 300 and 15 oscillations per minute at a place where dip angle is 600. Ratio of the total earths magnetic field at the two places is :


A
33:8
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B
16:93
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C
4:9
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D
23:9
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Solution

The correct option is B 16:93
At first place , horizontal component of earth's magnetic field is given by
Bh1=B1cos30=3B12
Bh2=B2cos60=B22
f21f22=Bh1Bh2
169=3B1B2
B1B2=1693

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