Home
Class 12
PHYSICS
A bar magnet having a magnetic moment of...

A bar magnet having a magnetic moment of `2xx10^(4) JT^(-1)` is free to rotate in a horizontal plane. A horizontal magnetic field `B=6xx10^(-4) T` exists in the space. The work done in taking the magnet slowly from a direction parallel to the field to a direction `60^(@)` from the field is

A

2J

B

0.6J

C

12J

D

6J

Text Solution

Verified by Experts

The correct Answer is:
D
`W=MB(cos theta_(1)-cos theta _(2))`
`= 2 xx 10^(4) xx 6xx 10^(-4)( cos theta - cos 60^(@))`
`=12xx(1)/(2)=6J`
Promotional Banner

Similar Questions

Explore conceptually related problems

A bar magnet having a magnetic moment of 1.0 xx 10^4 J T^(-1) is free to rotate in a horizontal plane. A horizontal magnetic field B = 4 xx 10^(-5) T exists in the space. Find the work done in rotating the magnet slowly from a direction parallel to the field to a direction 60^@ from the field.

A magnet having magnetic moment of 2.0 xx 10^(4) (J)/(T) is free to rotate in a horizontal plane where magnetic field is 6 xx 10^(-5) T . Find the work done to rotate the magnet slowly from a direction parallel to field to a direction 60^(@) from the field .

A bar magnet with magnetic moment 2.5xx10^(3)JT^(-2) is rotating in horizontal plane in the space containing magnetic induction B=4xx10^(5)T . The work done in rotating the magnet slowly from a direction parallel to the field to a direction 45^(@) from the field, is (in joule).

A uniform magnetic field of 0.20 xx 10^(-3) T exists in the space. Find the the change in the magnetic scalar potential as one moves through 50cm along the field.

A bar magnet of magnetic moment 1.5JT^-1 lies aligned with the direction of a uniform magnetic field of 0.22T . (a) What is the amount of work done to turn the magnet so as to align its mangetic moment (i) normal to the field direction, (ii) opposite to the field direction? (b) What is the torque on the magnet in cases (i) and (ii)?

For given arrangement ( in horizontal plane ) the possible direction of magnetic field :

The work done in rotating a magent of the magnetic moment 2Am^(2) in a magnetic field of induction 5 xx 10^(-3)T from the direction along the magnetic field to the direction opposite to the field , is

Sketch four magnetic field lines as obtained in a limited space on a horizontal plane in the earth's magnetic field alone.

The horizontal component of the earth's magnetic field is 3.6 xx 10^(-5) T where the dip is 60^@ . Find the magnitude of the earth's magnetic field.

A bar magnet of magnetic moment 6 J//T is aligned at 60^(@) with a uniform external magnetic field of 0.44 T. Calculate (a) the work done in turning the magnet to align its magnetic moment (i) normal to the magnetic field, (ii) opposite to the magnetic field, and (b) the torque on the magnet in the final orientation in case (ii).