Two magnetic poles one of which is three times as strong as the other exert on each other, a force equal to 3×10−3 when separated by a distance of 10cm. The strength of the each pole is
5Am,15Am
30Am,10Am
20Am,60Am
50Am,150Am
A
5Am,15Am
B
20Am,60Am
C
30Am,10Am
D
50Am,150Am
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Solution
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Let m1=3m2 F=μ04πm1m2r2=10−7×3m22/(0.1)2=3×10−3N ⇒3m22=300 ∴m2=10Am,m1=30Am
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