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Questions  

The ratio of magnetic moments of two short magnets which gives null deflection in tan B position at 6 cm and 9 cm from the center of a deflection magnetometer is

a
2 : 3
b
8 : 27
c
27 : 8
d
4 : 9

detailed solution

Correct option is B

According to question   B∝Md3M1d13=M2d23 ⇒M1M2=d1d23⇒M1M2=693=233=827 .

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