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Question

The ratio of magnetic moments of two bar magnets is 5:2. If the deflection produced by the first magnet in the D.M. in tanA position is 60o , the deflection due to the second magnet kept at the same distance in tan A position is :

A
greater than 45o
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B
less than 45o
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C
less than 30o
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D
greater than 90o
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Solution

The correct option is B less than 45o
The deflection off the magnetic needle in tan A position by a short magnet is given by
μo4π2MAd3=BHtanθA
tanθAtanθB=MAMB
tanθB=MBMA×3
tanθB0.7
θ less than 45o

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