Question

Why must work be done to move a magnet towards or away from a coil when an induced current flows?

Options

• The magnetic flux remains constant during motion.

• The induced current always assists the magnet’s motion.

• The coil has infinite resistance.

• The induced current opposes the magnet’s motion.

Answer 1

In either direction of motion, the induced current opposes the motion causing it. External work must therefore be done to keep moving the magnet.