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Q.

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

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a

30o

b

45o

c

60o

d

none of the above

answer is B.

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Detailed Solution

Here BV = BH[∵Time period with vertical and horizontal components is same)∴tan⁡θ=BVBH=1 or θ=45∘.
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