Two similar bar magnets P and Q each of magnetic moment M, are taken,. If P is cut along its axial line and Q is cut along its equatorial line, all the four pieces obtained have

Options

A. equal pole strength
B. magnetic moment `M/4`
C. magnetic moment `M/2`
D. magnetic moment `M`

Answer

C

Explanation

If the pole strength, magnetic moment and length of each part are `m^('), M^(') and L^(')`, repectively, then

`m^(')=m/2 m^(')=m`
`L^(')=L , L^(')=L/2`
`impliesM^(')=M/2 impliesM^(')=M/2`