Q22: Use Lenz’s law to answer the following questions con- cerning the direction of induced currents. Express your answers in terms of the letter labels a and b in each part of Figure P31.22.
(a) What is the direction of the induced current in the resistor R in Figure P31.22a when the bar magnet is moved to the left?
(b) What is the direction of the current induced in the resistor R immediately after the switch S in Figure P31.22b is closed?
(c) What is the direction of the induced cur- rent in the resistor R when the current I in Figure P31.22c decreases rapidly to zero?