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A magnetic compass needl oscillates 30 t...

A magnetic compass needl oscillates 30 times per minute at a place where the dip is `45^(@)` and 40 times per minute where the dip is `30^(@)` if `B_(1)` and `B_(2)` are respectively the total magnetic field due to the earth at the two places then the ratio `B_(1)//B_(2)` is best given by

A

3.6

B

1.8

C

1.2

D

0.7

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The correct Answer is:
D
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