I ampere current is flowing through a l metre long conducting . If the wire is shaped into a circular loop, then what will be its magnetic moment ?

Explanation

If the radius of the circular loop be r then ,
`2pir=l " or, "r=(l)/(2pi)`
and area of the loop, `A=pir^(2)=(l^(2))/(4pi)`
`therefore` The magnetic moment of the circular loop `=IA=(Il^(2))/(4pi)`.