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A circular coil of wire has a diameter of 20 cm and contains 10 loops, internal resistance of 8 ohms, and the coil is placed in a 2.00T external magnetic field. When 1 volt is applied to the coil, determine the maximum force exerted on the coil by the field.

First of all, I was thinking about using [tex]R = \rho \frac{l}{A}[/tex] and plug in the [tex] l [/tex] into [tex] F = IlB sin \theta [/tex]

But I wasnt given the [tex]\rho[/tex], so i try the torque formula:[tex]NIABsin\theta[/tex], but end up having Netwon * meter for the unit

How should i approach this problem?