a magnate 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 30 and 15 oscillations per minute at a place where dip angle is 60.the ratio of total earth magnetic field at the two places is

No.of oscillations,n=12πBsinθI2015=B1sin30B2sin60B1(1/2)B2(3/2)=2023152=1.73=2.943

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