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Q.

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

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a

00

b

300

c

450

d

900

answer is C.

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Detailed Solution

T1=2πIMBv→(1) T2=2πIMBH→(2)Dividing 21=T2T1=BvBH=tanθ [∴ Bv=BHtanθ] ⇒22=tanθ⇒tanθ=1 ⇒θ=450

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