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Question

In end on and broadside on position of a deflection magnetometer, if θ1 and θ2 are the deflections produced by short magnets at equal distances, then tanθ1/tanθ2 is

A
2:1
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B
1:2
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C
1:1
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D
None of these
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Solution

The correct option is A 2:1
B=BHtanθ

End On, Tan A: μ02Md4π(d2l2)2

Tan B: μ0M4π(d2+l2)3/2

tanθ1tanθ2=B1:B2=2:1 (l<<d)

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