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One bar magnet is suspended so as to rot...

One bar magnet is suspended so as to rotate freely in horizontal magnetic field. Then .....

A

It would become steady along east-west direction.

B

It would become steady along north-south direction.

C

It would become steady along vertical direction.

D

None of these.

Text Solution

Verified by Experts

The correct Answer is:
B
At every place on the surface of Earth, magnetic field is in the magnetic meridian along north-south direction. Hence if a bar magnet is suspended so as to rotate freely in horizontal plane, it gets aligned along `overset(to)(B_h)` and so torque exerted on it becomes zero.
`tau= m(B_h) sin0^(@) = 0`
Thus, bar magnet attains stable equilibrium when its axis is along north-south direction, with `overset(to)(m)` pointing towards north.
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Knowledge Check

  • Magnetic field lines ......

    A
    always intersect.
    B
    always form closed loops.
    C
    are more crowded away from the magnet.
    D
    can not pass through vacuum.

  • That end of bar magnet (suspended so as to rotate freely in horizontal plane) which points towards geographic north direction is known as ...... pole of magnet.

    A
    positive
    B
    negative
    C
    north
    D
    south

  • Intensity of magnetic field means ......

    A
    magnetic dipole moment per unit volume.
    B
    magnetic force per unit pole strength.
    C
    no. of magnetic field lines passing through unit area.
    D
    no. of magnetic field lines per unit volume.

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