Posted by **Phy** on Saturday, April 6, 2013 at 12:24am.

A simple motor has N=250 turns of wire on a coil measuring 12 cm \times \, 4 cm. It's resistance is R=10 ohms. The magnetic field is B=1 T.

(a) How much current (in Ampere) in the coil is needed to produce a maximum torque of 40 Nm?

b) What maximum EMF (in Volts) is needed to drive the motor at 50 Hz if the current is constant?

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