Lenz's law states that the direction of an induced current is such that it
Correct answer: B. opposes the change producing it
- A. assists the change producing it
- B. opposes the change producing it
- C. is always clockwise
- D. is independent of the change
Explanation
The induced current sets up a field that opposes the flux change, so pushing a north pole towards a coil induces a current making the near face a north pole, which resists the approach. This opposition is why work must be done to move the magnet, and that work is the source of the electrical energy produced. Lenz's law is therefore conservation of energy applied to induction.
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About Lenz's Law
Lenz's law states that the induced current flows in a direction that opposes the change in magnetic flux producing it. Questions connect this rule with Faraday's law, magnetic flux, induced emf and the direction of motion or current, while distinguishing opposition to flux change from opposition to the magnetic field itself.
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