Magnetic force exerted by the magnetic field on a current-carrying wire...

Magnetic force exerted by the magnetic field on a current-carrying wire

A 20-turn 5.0 cm by 5.0 cm coil hangs with the plane of the coil parallel to a 0.12-T magnetic field. (a) Determine the torque on the coil when there is a 0.50-A current through it. (b) The support for the coil exerts an opposing torque, which increases as the coil is deflected. The opposing torque is calculated using the equation τ = -0.016 θ (in units of N . m), with the angle u in units of radians (Figure P17.17). At approximately what angle does the magnetic torque balance the torque caused by the supporting wire?