The magnetic coupling will be strongest at the point where the wires of the
two loops come closest. When the switch is closed the current in the bottom loop will
start to flow clockwise, which is from left to right in the top portion of the bottom
loop. To oppose this change, a current will momentarily flow in the bottom of the
top loop from right to left. Thus the current in the top loop is momentarily clockwise
when the switch is closed. Similarly, when the switch is opened, the current in the
top loop is momentarily counterclockwise.