Q.

The Relation between force between the two poles in free space and medium

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a

FmFa=μr

b

FaFm=μr

c

FmFa=μ

d

FaFm=μ

answer is A.

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Detailed Solution

Reason & Explanation:Force between the two poles in free space is Fa=μo4πmm2  1 r2 ----------(1)Force between the two poles in free space is  Fm=μ4πm1m2r2-----------(2)(2)/(1)  ⇒ FmFa=μμ0=μrMagnetic permeability of free spaceμ→  Magnetic permeability of mediumμr→ Relative permeability of medium
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