Magnetism and M...

The needle of a deflection galvanometer shows a deflection of 60° due to a short bar magnet at a certain distance in tan A position. If the distance is doubled, then deflection is

The magnetic field due to short bar magnet of magnetic dipole moment M and length 2l, on the axis at a distance z (where z >> l)from the centre of the magnet is given by the formula

Two identical thin bar magnets each of length l and pole strength m are placed at right angles to each other, with north pole of one touching south pole of the other, then the magnetic moment of the system is

Two short magnets of equal magnetic moments are placed on a piece of cork which floats on water. The magnets are so placed that the axis of one produced bisects the axis of the other at right angles. Then the cork

A compass needle is placed at the magnetic pole of earth. It

A thin bar magnet of length 2 l and breadth 2 b pole strength p and magnetic moment M is divided into four equal parts with length and breadth of each part being half of original magnet. Then the pole strength of each part is

Magnetic lines of force are