(27-36) A 13.0-cm-diameter circular loop of wire is placed with the plane of the loop parallel to th

(27-36) A 13.0-cm-diameter circular loop of wire is placed with the plane of the loop parallel to the uniform magnetic field between the pole pieces of a large magnet. When 4.20 A flows in the coil, the torque on it is 0.185 m • N. What is the magnetic field strength?

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the 'radius' part of the equation should be .13/2, since .13m is the diameter