A flexible, non-conducting circular ring carrying a uniform negative charge is rotating clockwise in a uniform magnetic field B B\,B directed out of the page, as shown in the diagram.
What is the effect of the magnetic force on the ring due to the interaction between the moving charges and the magnetic field?
It causes an increase in the diameter of the ring.
It causes a decrease in the diameter of the ring.
It experiences a net torque tending to rotate it about an axis in the plane of the ring.
It experiences a net translational force in the plane of the ring.