The magnetic force required to demagnetise the material is

The coercive force for a certain material is 10^4 A/m. A magnet made out of this material is placed inside a solenoid having 1000 turns/metre. What amount of electric current is required to demagnetise the material completely?

The coercivity of a certain permanent magnet is 4*0xx10^4Am^-1 . This magnet is placed inside a solenoid 15cm long and having 600turns . Calculate the current required to demagnetise the magnet completely.

Find the amount of current required to demagnetise a permanent magnet of coercivity 3 xx 10^4 Am^(-1) kept inside a 0.2 m long solenoid of 500 turns.

The magnetism acquired by a magnetic material as long as it is in contact with a magnet

Demagnetisation

A force F is required to break a wire of length L and radius r. Find the force required to break a wire of the same material, length 2L and radius 4r.

Magnetic force can pass through non-magnetic materials.

The space or region around a magnet in which a force is experienced by magnetic material is called