Question

A current loop in a magnetic field
A. can be in equilibrium in one orientation
B. can be in equilibrium in two orientation both the equilibrium states are unstable
C. can be in equilibrium in two orientation one stable while the other is unstable
D. experiences a torque whether the field is uniform or non uniform in all orientations.

Answer 1

Correct Answer - C
`vec(tau)= vec(M)xxvec(B)rArr tau=MB sinalpha`.
`alpha = 0^@` corresponds to stable equilibrium ,
`alpha = 180^@` corresponds to unstable equilibrium.