Question

If at the centre of the given solenoid, an iron ring is placed coaxially .Then identify in which direction will the magnetised iron ring's north-pole will be?

• A. 1
• B. 2
• C. There won't be any north as the magnetic field lines will be circular in clockwise direction inside the magnet
• D. There won't be any north as the magnetic field lines will be circular in anti-clockwise direction and inside the magnet

Answer 1

The correct option is B

2

Every magnetic material has domains (which act as Tiny magnets), which point in a random direction when there is no external magnetic field. So, the magnetic field of individual domains cancels out each other, resulting in zero net magnetism.

But, when an external magnetic field is applied, these domains point in the direction of the external magnetic field.

In the given figure the solenoid's North will be towards 2.

The north pole of the magnetised iron will also be in that direction.