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A circular coil of radius $4 \mathrm{~cm}$ and of 20 turns carries a current of 3 amperes. It is placed in a magnetic field of intensity of 0.5 weber $/ \mathrm{m}^2$. The magnetic dipole moment of the coil is
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0.3 ampere $-m^2$
0.3 ampere \(-m^2\)
\(M=N L A=20 \times \frac{22}{7}\left(4 \times 10^{-2}\right)^2 3=0.3 \mathrm{~A}-\mathrm{m}^2\)
\(M=N L A=20 \times \frac{22}{7}\left(4 \times 10^{-2}\right)^2 3=0.3 \mathrm{~A}-\mathrm{m}^2\)
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