A magnet is released along the axis of a copper coil as shown in the diagram. State the polarity at the top end of the coil when the magnet leaves the coil.

Explanation

According to Lenz's law, the induced current will flow in a direction such that it opposes the change in magnetic flux. When the magnet leaves the coil, the magnetic flux decreases, so the induced current will flow in a direction that tries to maintain the flux. This means the top end of the coil will be north.

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