A long thin magnet of moment `M` is bent into a semi circle. The decrease in the magnetic moment is

A magnetized steel wire has a magnetic moment M. It is bent into a semi-circle. The new magnetic moment is

A metallic wire of 10pi cm and of magnetic moment M is bent into a semi circle. Calculate the new magnetic moment.

A bar magnet of moment M is bent into arc, its moment

A steel wire of length l has a magnetic moment M . It is then bent into a semicircular arc. The new magnetic moment is