According to Lenz's law, what is the direction of an induced electric current in a closed conducting loop?
Answer and explanation
Correct answer: A. It flows in a direction such that its magnetic field opposes the change in magnetic flux that produced it
- Step 1: Lenz's law is a consequence of conservation of energy applied to electromagnetic induction.
- Step 2: The induced current establishes an induced magnetic field whose direction opposes the change in the external magnetic flux that induced it.
Answer
It flows in a direction such that its magnetic field opposes the change in magnetic flux that produced it.
Why not the others: 'Always clockwise' is false as direction reverses when flux increases vs decreases; 'Reinforces flux' violates energy conservation; 'Oscillates at resonant frequency' describes AC LC circuits.
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