Two coils are placed near each other as shown in the figure below. The coil on the left is connected to a battery and a switch, and the coil on the right is connected to a resistor.
(a) What is the direction of the current in the resistor at an instant immediately after the switch is thrown closed?
(b) What is the direction of the current in the resistor after the switch has been closed for several seconds?
(c) What is the direction of the current in the resistor at an instant after the switch has then been thrown open?