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A current carrying coil is freely suspen...

A current carrying coil is freely suspended in a uniform magnetic field. The coil tends to set its plane ______ .

A

Parallel to the magnetic field

B

Perpendicular to the magnetic field

C

Inclined to the magnetic field

D

Continuously rotating

Text Solution

Verified by Experts

The correct Answer is:
B
The couple acting on current coil freely suspended in uniform magnetic field is given by `tau=IBIxxbsin alpha =IBA sinalpha`

`implies tau` is maximum when `alpha= 90^(@)` i.e., when the plane of the coil is parallel to the magnetic field
`implies tau =0` when `alpha`=0 i.e., when the plane of the coil is perpendicular to the magnetic field Hence the couple sets the coil in a position in which its plane is perpendicular to the magnetic field. It is the position of stable equilibrium of the coil.
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