State and explain Lenz's law - Vidyadip

Question

State and explain Lenz's law

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Answer

• Lenz's law :
→"The polarity of induced emf is such that it tends to produce a current which opposes the change in magnetic flux that produced it."

→In experiment of coil and magnet, keeping N -pole of magnet facing coil and moving magnet towards coil, magnetic flux linked with coil increases. As a result, electric current is induced in it.
→According to Lenz's law, this induced electric current is in such direction that it opposes increase in flux.
→This is possible only when end of coil towards magnet acts as N -pole and induced current flow in anti-clockwise direction, as shown in figure (a).
→In the same manner, as shown in figure (b), on taking N -pole of magnet away from coil, magnetic flux linked with coil decreases. As a result induced electric current flows in clockwise directions.
→The induced current is in such a direction that end of coil towards magnet behaves as S-pole.
→Thus, on changing magnetic flux linked with coil, induced current (and induced emf) is produced in such a direction that it opposes the change in magnetic flux.

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