Explanation
The restoring torque is due to horizontal component of earth’s field.
The value of H is fairly uniform
A superconductor exhibits perfect diamagnetism.
Iron is most suitable for electromagnets and transformers, because of low energy losses.
Partially filled inner subshells are responsible for ferromagnetic behavior of such substances.
This magnetising field is a measure of coercivity of the material.
Magnetisation of steel bar increases first, and then becomes maximum (constant).
Field in the core with Bismuth will be smaller because bismuth is diamagnetic.
Because of large permeability of soft iron, magnetic lines of force prefer to pass through it. Concentration of lines in soft iron bar increases as shown in fig.
Ferrites are alloys whose conductivity is low.
On increasing the temp. By 700ºC, the magnetic needle is demagnetised. Therefore, the needle stops vibrating.
At magnetic north pole of earth, H = 0 and δ = 90º, maximum
Inside a magnet, its magnetic lines of force move from south pole of a magnet towards its north pole. The statement (c) is incorrect
In a non uniform magnetic field, a magnetic needle experiences both, a force and a torque.
The magnetic field lines due to a bar magnet are closed continuous curves directed from N to S outside the magnet and directed from S to N inside the magnet. Choice (d) is correct.
As the magnetic lines of force are closed continuous curves, and their direction outside the magnet is from north to south, therefore, inside the magnet, the magnetic lines of force are from S pole to N pole of the magnet.
Please disable the adBlock and continue. Thank you.
