Answer
(a) zero
(b) zero
(c) counter clockwise
(d) to the left
Work Step by Step
(a) We know that the induced current in the ring is zero because if the ring is completely inside the field region and moves to the right then there is no change in the magnetic field and hence there is no change in the magnetic flux.
(b) We know that there is no force on the ring because there is no induced emf and hence no current is produced.
(c) We know that if the ring is emerging from the field moving to the right then the ring experiences a decrease in the magnetic field and hence produces a change in the magnetic flux. The ring will compensate for this change by generating a counter-clockwise current to form a magnetic field out of the page.
(d) We know that as the ring leaves the magnetic field, a force will be generated on the left side of the ring, while the right side of the ring will have zero force since it has dropped out of the field. Thus, the net force generated by the ring will be to the left, counteracting the force moving the ring to the right.
