The Problem states:
A metallic ring of Mass $M$ and radius $r$ falls freely under the influence of gravity in the direction along the negative Z-axis. A magnetic field $B_z = B_0(1-z\lambda)$ where $z$ is the Z coordinate of the center of the ring, also exists along the positive Z-axis. Initially , the center of the ring is at the origin. The resistance of the ring is $R$ .The plane of the ring is perpendicular to the Z-axis. Find the terminal velocity of the ring.
I figured, since the question is asking for a terminal velocity , there should be a force acting on the ring in the direction opposite to the gravitational force. But the force on a small segment of the ring , by the magnetic field due to the induced current would be radially inwards. Hence , the total force on the ring by the magnetic field would be zero.
My question is where would this force arise from?