Question

A permanent magnet gets demagnetised if it is kept within a solenoid and an alternating current is passed through it. Why? ​

Answer 1

Answer:

A magnet being placed in a solenoid which has an alternating current being passed through it will have its long range ordering disrupted, in much the same way that direct current can cause ordering. In an electromagnet which uses a soft iron core, ceasing the flow of current will eliminate the magnetic field.