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Lenz's Law
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Lenz's Law
Recommended for Class 10
Lenz's Law
Lenz's law gives the direction of induced current.
It states:
> The induced current flows in a direction such that the magnetic effect it produces opposes the change that caused it.
The induced effect opposes the change in magnetic flux, not necessarily the magnetic field itself.
Example — Magnet Approaching Coil
If a north pole approaches a coil, the coil produces a magnetic field that opposes the approach.
The near side of the coil behaves like a north pole.
Magnet Moving Away
If the same pole moves away, the coil produces a magnetic effect that tries to oppose the decrease in flux.
Why This Matters
Lenz's law is consistent with conservation of energy.
If induced current helped the change instead of opposing it, energy could be produced without corresponding work.
Lenz's Law — Advanced
Common Mistakes
Common Mistakes
- Mistake
Lenz's law does not mean induced current always points opposite to the external current.
- Mistake
It opposes the change causing induction.
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Practice
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Q1. state law
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Q2. approaching magnet
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Q3. receding magnet
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Q4. conservation idea
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Q5. Faraday negative sign.
Exam Practice
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Q1. state law
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Q2. approaching magnet
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Q3. receding magnet
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Q4. conservation idea
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Q5. Faraday negative sign.
School-standard facts for Matric and Intermediate. Original explanations — not copied from textbooks.