A 200 turn closely wound circular coil of radius 15 cm carries a current of 4 A. The magnetic moment of this coil is
A 200 turn closely wound circular coil of radius 15 cm carries a current of 4 A. The magnetic moment of this coil is
A. `36.5A m^(2)`
B. `56.5A m^(2)`
C. `66.5A m^(2)`
D. `108A m^(2)`
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Correct Answer - B
The magnetic moment is given by
`|vecm|=NIA=NI pi r^(2)=200xx4xx3.14xx(15xx10^(-2))^(2)`
`=200xx4xx3.14xx15xx15xx10^(-4)="56.5 A m"^(2)`
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