A circular coil of radius 10 cm and 100 turns carries a current 1 A. What is the magnetic moment of the coil ?

Options

A. `3.142 xx 10^(4) Am^(2)`
B. `10^(4) A m^(2)`
C. `3.142 A m^(2)`
D. `3 A m^(2)`

Answer

C

Explanation

`M = NIA = NI pi r^(2) = 10^(2) xx 1 xx 3.142 xx 10^(-2) = 3.142 Am^(2)`