A short bar magnet placed with its axis at \(45^{\circ}\) with an external field of \(400 \times 10^{-4} \mathrm{~T}\) experiences a torque of 0.024 Nm . If a solenoid of cross-sectional area \(10^{-4} \mathrm{~m}^2\) and 500 turns replaces the short bar magnet such that they have the same magnetic moment, then the current flowing through the solenoid is:

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.