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Q.

Two magnetic poles one of which is three times as strong as the other exert on each other a force equal to 3×10−3N when separated by a distance of  10cm . The strengths of each pole in  Am

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a

20, 60

b

10, 30

c

5, 15

d

30, 90

answer is B.

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Detailed Solution

We know force between dipoles is   F=μ04πm1m2d2, m1=m, m2=3m                    ⇒3×10−3=4π×10−74π3m210−2 ⇒m2=102                  ⇒m=10Am, ∴ m1=10Am  and   m2=30Am
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