Question

A current carrying a coil suspended freely in a uniform magnetic field is in stable equilibrium, if the angle between its magnetic dipole moment vector and the magnetic field is

• A. ${180}^0$
• B. zero
• C. ${45}^0$
• D. ${90}^0$

Answer 1

The correct option is B zero

A current carrying coil behaves as a magnetic dipole.

Now we know that most stable position for dipole placed in a magnetic field is when angle between its magnetic moment and the external magnetic field is zero.

In this position potential energy of the system is minimum therefore, it is in stable equilibrium position.