1.

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

Answer»

It would become steady along east-west direction.
It would become steady along north-south direction.
It would become steady along vertical direction.
None of these.

Solution :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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