Assertion (A) : If a magnetic north pole of a bar magnet is moving towards a circular conducting loop, the current will flow in the loop in the clockwise direction from the magnet.
Reason (R) : An induced current has a direction such that the magnetic field due to the induced current opposes the change in the magnetic flux that induces the current.
In the light of the above statements, choose the most appropriate answer from the options given below :
Analysis of Assertion (A) and Reason (R)
Evaluating Assertion (A): Induced Current Direction
Assertion (A) states that when a magnetic north pole moves towards a circular conducting loop, the induced current flows clockwise from the magnet's perspective.
- When a north pole approaches the loop, the magnetic flux through the loop increases in the direction of the magnet's field.
- According to Lenz's Law, the induced current must create a magnetic field that opposes this *increase* in flux.
- To oppose the incoming north pole, the loop must generate its own north pole facing the magnet.
- A magnetic field pointing outwards from the loop (towards the approaching magnet) requires a counter-clockwise current when viewed from the perspective of the approaching magnet.
- Therefore, Assertion (A) is incorrect.
Evaluating Reason (R): Lenz's Law Statement
Reason (R) states: "An induced current has a direction such that the magnetic field due to the induced current opposes the change in the magnetic flux that induces the current."
- This statement accurately describes Lenz's Law, a fundamental principle of electromagnetic induction.
- Therefore, Reason (R) is correct.
Conclusion
Based on the analysis:
- Assertion (A) is incorrect.
- Reason (R) is correct.
This matches the option stating that (A) is not correct but (R) is correct.
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