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The coil of wire is placed in a series with the sensitive ammeter, and a known pole of the bar magnet is pushed into the coil at a steady speed. We observe and note the direction of the deflection of the ammeter which indicates that an induced current is flowing in the coil.
Now, we pull the magnet away from the coil at the same speed and observe the ammeter again. The deflection occurs in the opposite direction compared to when the magnet was approaching.
The ammeter shows a current when the magnet moves, but the direction of the current reverses when the motion is reversed. This shows that the induced current always opposes the change in magnetic flux (motion of the magnet).
Lenz’s Law states that the direction of an induced current is such that it opposes the change that caused it. So When the magnet approaches, the coil produces a magnetic field that opposes the incoming magnet and when the magnet moves away, the coil’s induced field tries to pull the magnet back.
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