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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 s. The same needle is then allowed to vibrate in the horizontal plane and the time period is again found to be 2 s. Then the angle of dip is

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a

0o

b

30o

c

45o

d

90o

answer is C.

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Detailed Solution

In vertical plane perpendicular to magnetic meridian, T=2πIMBV .......(i)In horizontal plane,T=2πIMBH .......(ii)Equations (i) and (ii) give, BV=BHHence, by using tan ϕ=BVBH⇒tan ϕ=1⇒ϕ=45o

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