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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

4 : 5
16 : 25
64 : 125
2 : 5

detailed solution

Correct option is C

For null deflection, M1M2=d1d23=40503=64125

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