Current i is carried in a wire of length L. If the wire is turned into a circular coil, the maximum magnitude of torque in a given magnetic field B will be

(a) $\frac{Li{B}^{2}}{2}$                     (b) $\frac{L{i}^{2}B}{2}$

(c) $\frac{{L}^{2}iB}{4\mathrm{\pi }}$                      (d) $\frac{L{i}^{2}B}{4\mathrm{\pi }}$

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