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Questions  

The magnetic scalar potential due to a magnetic field at a point on its axis situated at a distance of 20 cm from its center is found to be 1.2×105 V . Then, the magnetic moment of the dipole is 

a
4.8 Am2
b
9.6 Am2
c
2.4 Am2
d
1.2 Am2

detailed solution

Correct option is A

The magnetic potential due to dipole is  V=μ04π.M cosθr2Given  : V=1.2×10-5 Tm ;  θ=00 ; r=0.2 m∴1.2×10−5=10−7M0.22 ⇒M=4.8 Am2 .

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