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Q.

Two short magnets with their axes horizontal and perpendicular to the magnetic meridian are placed with their centres 40cm east and 50cm west of magnetic meridian. If the needle remains undeflected, the ratio of their magnetic moments  M1 : M2 is

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a

4 : 5

b

16 : 25

c

64 : 125

d

2 : 5

answer is C.

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Detailed Solution

For null deflection, M1M2=d1d23=40503=64125
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