a) Give a counterexample to show that the following statement is false: "When the magnetic field through a loop changes, currents run in the loop in such a way as to make a new magnetic field in the opposite direction to the original one."
(b) Two metal rings lie side by side on a table. Current in the left ring runs clockwise and is increasing with time. This induces a current to run in the right ring. Does this induced current run clockwise or counterclockwise? Explain, using a diagram.
AP3
A wire loop is pulled through a region of magnetic fields shown below. B2 < B1. The loop has length L, height h, and resistance R. You pull with a constant force F such that the velocity of the loop is constant. Calculate the speed in terms of the known quantities B1, B2, L, h, R and F.
