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Q.

The magnetic induction at a distance ‘d’ from the magnetic pole of unknown strength ‘m’ is B. If an identical pole is now placed at a distance of 2d from the first pole, the force between the two poles is

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a

mB

b

mB2

c

mB4

d

2mB

answer is C.

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Detailed Solution

B=μo4πmd2  and  F=μ04πmm(2d)2=μo4πmd2×m4=Bm4
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