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Explanation of Lenz's Law: Case-I

Lenz's law describes the direction of induced current in a coil. When a magnet moves toward the coil, the magnetic flux increases which induces a current in the coil. According to Lenz's law, this induced current will create a magnetic field opposing the increase in flux. When a magnet moves away from the coil, the magnetic flux decreases which induces a current in the coil. This induced current will create a magnetic field opposing the decrease in flux as described by Lenz's law.

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232 views2 pages

Explanation of Lenz's Law: Case-I

Lenz's law describes the direction of induced current in a coil. When a magnet moves toward the coil, the magnetic flux increases which induces a current in the coil. According to Lenz's law, this induced current will create a magnetic field opposing the increase in flux. When a magnet moves away from the coil, the magnetic flux decreases which induces a current in the coil. This induced current will create a magnetic field opposing the decrease in flux as described by Lenz's law.

Uploaded by

MCH
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as DOCX, PDF, TXT or read online on Scribd
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Explanation of Lenz's Law

For understanding Lenz's law, consider two cases :


CASE-I When a magnet is moving towards the coil.

When the north pole of the magnet is approaching towards the coil,
the magnetic flux linking to the coil increases.
According to Faraday's law of electromagnetic induction, when there
is change in flux, an emf and hence current is induced in the coil
and this current will create its own magnetic field.
Now according to Lenz's law, this magnetic field created will oppose
its own or we can say opposes the increase in flux through the coil
and this is possible only if approaching coil side attains north
polarity, as we know similar poles repel each other.
Once we know the magnetic polarity of the coil side, we can easily
determine the direction of the induced current by applying right
hand rule.
In this case, the current flows in anticlockwise direction.

CASE-II When a magnet is moving away from the coil

When the north pole of the magnet is moving away from the coil,
the magnetic flux linking to the coil decreases.
According to Faraday's law of electromagnetic induction, an emf and
hence current is induced in the coil and this current will create its
own magnetic field.
Now according to Lenz's law, this magnetic field created will oppose
its own or we can say opposes the decrease in flux through the coil

and this is possible only if approaching coil side attains south


polarity, as we know dissimilar poles attract each other.
Once we know the magnetic polarity of the coil side, we can easily
determine the direction of the induced current by applying right
hand rule.
In this case, the current flows in clockwise direction.

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