Find magnetic moment in following cases

(Eash segment is of length l)

Find the magnetic field at point P in following cases

A magnetic wire magnetic moment M is bent into a shape with all segments of equal length the new magnetic moment is

An iron rod of length L and magnetic moment M is bent in the form of a semicircle. Now its magnetic moment will be

An iron rod of length L and magnetic moment M is bent in the form of a semicircle. Now its magnetic moment will be

An iron rod of length L and magnetic moment M is bent in the form of a semicircle. Now its magnetic moment will be

The magnetic field due to current in a straight wire segment of length L at a point on its perpendicular bisector at a distance r ( r gt gt L)

The magnetic field due to current in a straight wire segment of length L at a point on its perpendicular bisector at a distance r ( r gt gt L)

For a circular coil magnetic moment is M r is the radius and L is the length of the coil then M is proportional to