When two magnetic moments are compared using equal distance method, the deflections produced are 45o and 30o. If the length of magnets are in the ratio I : 2, the ratio of their pole strengths is

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3 : 1

3 : 2

3 : 1

23 : 1

answer is D.

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Detailed Solution

B=BHtanθ;μ04π2Md3=BHtanθ; M α tanθ M1M2=tanθ1tanθ2⇒m1L1m2L2=tanθ1tanθ2m1m2=21 x tan45otan30o=231

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