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State and explain Lenz.s law for induced emf. |
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Answer» Solution :Statement : The polarity of induced emf is such that it TENDS to PRODUCE a current which opposes the CHANGE in MAGNETIC flux that produced it. Diagram:  Explanation : When North pole of a bar-magnet is moved towards the coil (fig.1). emf is induced in the coil. This induces current in the anti-clock wise direction through the coil so as to generate North-pole. This opposes the MOVEMENT of the magnet. When North-pole is moved away from the coil(Fig.2) emf induces again. This current in the clockwise direction through the coil so as to generate South-pole. It opposes the movement of the magnet. |
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