First slide
Earth's Magnetism
Question

A magnetic needle vibrates in the vertical plane perpendicular to the magnetic meridian. Its time period is 2 seconds. If the same needle vibrates in the horizontal plane and the time period is again 2 seconds, what is the angle of dip at that place

Easy
Solution

Here BV = BH
[Time period with vertical and horizontal components is same)
tanθ=BVBH=1 or θ=45.

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