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Q.

In two separate experiments, the neutral points due to two small magnets are at a distance of r and 2r in broad side-on position. The ratio of their magnetic moments will be

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a

4: 1

b

1:2

c

2 : 1

d

1 : 8

answer is D.

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Detailed Solution

At broad side-on position, B=μ04πMd3=BH

∴M1d13=M2d23 or M1r3=M28r3 or M1M2=r38r3=18

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