A magnet is released along the axis of a copper coil as shown in the diagram. The direction of the current is from A to B when magnet enters the coil. What will be the direction of the current 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 enters the coil, the magnetic flux increases, so the induced current will flow in a direction that tries to oppose this increase. This means the current will flow from B to A. When the magnet leaves the coil, the magnetic flux decreases, so the induced current will flow in the opposite direction, from A to B.
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