The Earth's magnetic field at a given point is \( 0.5 \times 10^{-5} \text{ Wb/m}^2 \).
This field is to be annulled by magnetic induction at the center of a circular conducting loop of radius 5 cm.
The current required to be flown in the loop is nearly:

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.