CUET · PHYSICS · PYQ PAPER 2023

If a copper wire carries a direct current, the magnetic field associated with the current would be:

A Only inside the wire
B Only outside the wire
C Both inside and outside of the wire
D No magnetic field would exists due to direct current

Verified Solution

Answer & Solution

Correct Answer

(C) Both inside and outside of the wire

Step-by-step Solution

Detailed explanation

According to Ampere’s Law, a magnetic field is produced outside the wire in concentric circles. Additionally, a magnetic field exists inside the wire, starting from zero at the central axis and increasing linearly toward the surface. C) Both inside and outside of the wire.

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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