A steel wire of length Thas a magnetic moment M. It is bent into L shape from middle. The new magnetic moment is

Options

A. `M/sqrt2`
B. `M/2`
C. `sqrt2M`
D. 2M'

Answer

A

Explanation

When the wire is bent into L shape, the effective distance between the poles `=sqrt((l/2)^2+(l/e)^2)=l/sqrt2`
`M.=mxxl/sqrt2=M/sqrt2`