A coil in the shape of an equilateral triangle of side \(2 \mathrm{~cm}\) is suspended from a vertex such that it hangs in a vertical plane between the poles of a permanent magnet producing a horizontal magnetic field of \(100 \times 10^{-3} \mathrm{~T}\). The magnetic field is parallel to the plane of the coil. For the moment of couple acting on the coil to be \(2 \sqrt{3} \times 10^{-5} \mathrm{Nm}\), the current to be passed through the coil 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.