There is an electrical circuit that includes a flat circular coil. A small compass is placed close to the coil along its axis. When the switch is closed, the compass needle deflects so that it points in the direction North, away from the coil.
Okay, there is a graph with shows how the current varies with time t after the switch is closed.
It starts at 6A and decreases to 2A at 1.5 seconds and remains constant.
Explain why the current changes. 4 marks.