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Q.

A compass needle oscillates 20 times per minute at a place where dip is 450 and 30 times per minute where dip is 300 . The total magnetic field of earth at second to first places is

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a

1.51

b

1.83

c

1.63

d

1.23

answer is B.

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Detailed Solution

BH2BH1=T12T22⇒B2cosδ2B1cosδ1=T12T22∴B2B1=T12cosδ1T22cosδ2
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