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Question

Two short magnets are kept on opposite arms of the DMM at 12 cm and 16 cm. If there is no deflection in the needle, the ratio of the magnetic moments is :

A
3 : 4
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B
4 : 3
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C
9 : 14
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D
27 : 64
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Solution

The correct option is D 27 : 64
The deflection of the magnetic needle in tan A position by a short magnet is given by ,

μo4π2MAd3=BHtanθA

Since the deflection is zero ,
MAMB=d3Ad3B

MAMB=27:64

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