A small hole is made at the centre of the magnet then its magnetic moment :

decreases

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses

increases

No worries! We‘ve got your back. Try BYJU‘S free classes today!

remains same

No worries! We‘ve got your back. Try BYJU‘S free classes today!

depends on the nature of the magnetic material

No worries! We‘ve got your back. Try BYJU‘S free classes today!

Open in App

Solution

The correct option is A decreases
The magnetic field lines in the hole will be from North pole to South pole where as the magnetic field lines in the magnet will be from South pole to North pole.

$∴$ The net magnetic field lines inside the magnet get decreased which results in the decrease of the net pole strength which results in the decrease in magnitude of the magnetic moment.

Suggest Corrections

Similar questions

Q. If a hole is made at the centre of a bar magnet, then its magnetic moment will

Q. The magnetic induction at a distance of

20 c m

from centre of a short magnetic dipole having magnetic moment

0.5 A m^{2}

on its axis is:

Q. The magnetic dipole moment of a small bar magnet is

1.6 A m^{2}

. It is placed in magnetic meridian with its north pole pointing toward geographic south of the earth. If the neutral point is obtained at

20

cm from the centre of the magnet then, the horizontal component of earth's magnetic field is:

Q. Assertion (A) : When small holes are made in the body of the magnet, its magnetic moment decreases
Reason (R) : For a magnet Intensity of magnetisation remains constant and on making holes, magnetised volume decreases, hence magnetic moment decreases

The magnetic field strength at a point at a distance d from the centre on the axial line of a very short bar magnet of Magnetic moment $M$ is $B$ . The Magnetic induction at a distance $2 d$ from the centre on the equatorial line of a Magnetic Moment $8 M$ will be

Join BYJU'S Learning Program