First slide
Earth's Magnetism
Question

A dip needle vibrates in the vertical plane perpendicular to the magnetic meridian. The time period of vibration is found to be 2 seconds. The same needle is then allowed to vibrate in the horizontal plane and the time period is again found to be 2 seconds. Then the angle of dip is

Moderate
Solution

BH=BV ; θ=45o ; tan θ=BVBH=1 θ=tan-1(1)=45o

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