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

A magnet of magnetic moment M and having moment of inertia I , is suspended to orient freely in the horizontal plane under the influence of earth's magnetic field . If it is slightly disturbed , the time period is given by

A magnet of magnetic moment M and having moment of inertia I , is suspended to orient freely in the horizontal plane under the influence of earth's magnetic field . If it is slightly disturbed , the time period is given by

The two ends of a horizontal conducting rod of length l are joined to a voltmeter. The whole arrangement moves with a horizontal velocity v , the direction of motion being perpendicular to the rod. The vertical component of the earth's magnetic field is B . The voltmeter reading is

A bar magnet having a magnetic moment of 2 xx 10 ^(4) JT ^(-1) is free to rotate in a horizontal plane. A horizontal magnetic field B = 6 xx 10 ^(-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 bar magnet having a magnetic moment of 2 xx 10^4 JT^(-1) is free to rotate in a horizontal plane. A horizontal magnetic field B = 6 xx 10^(-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 bar magnet having a magnetic moment of 2 xx l0 ^4 JT^-1 is free to rotate in a horizontal plane. A horizontal magnetic field B = 6 xx 10^-4 T exits 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:

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