Two wires of same length are shaped into a square and a circle. If they carry same current, ratio of the magnetic moment is

Options

A. `(pi//2)`
B. `(pi//3)`
C. `(pi//8)`
D. `(pi//4)`

Answer

D

Explanation

`MooA`
`therefore (M_(s))/(M_(c))=(pir^(2))/(l^(2))=(pi(L/(2pi)))/(((L)/(4))^(2))=(pi)/(4)`