A circular coil of radius 10 cm having 100 turns carries a current of 3 A. Find the magnetic moment of the coil.
(Take, `mu_(0)= 4pi xx 10^(-7))`

Explanation

Here, `N=100` turns
Radius, `r=10 cm =0.1 m,` current, `i =3A`
`:.` Magnetic moment , `M=NiA`
`=100 xx 3 xx pi xx (0.1)^(2)=9.42"A-m"^(2)`