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Question

A short magnet produces a deflection of 30o when placed at some distance in tanA position of the magnetometer. If another magnet of same length and double the pole strength is kept at the same distance in tanB position, the deflection produced is

A
30o
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B
60o
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C
45o
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D
0o
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Solution

The correct option is A 30o
Given,
μ04π2Mdd3=BHtanθA
μ04π2×Mdd3=BHtanθB
From the above two equations, tanθA=tanθB
θB=30 since given θA=30

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