An electric motor consists of a rectangular coil placed in a uniform magnetic field between two magnetic poles, connected to a DC power supply via a split-ring commutator.
Explain why the coil rotates when a current passes through it.
A dynamo and an alternator are both types of generators used to convert mechanical energy into electrical energy. Describe two similarities and two differences in how these two devices function.
Suggest one way to increase the peak electrical output of these generator devices.
A straight conductor is placed perpendicular to a magnetic field of magnetic flux density 0.80 T0.80\text{ T}0.80 T. When a current of 1.5 A1.5\text{ A}1.5 A flows through the conductor, it experiences an electromagnetic force of 0.36 N0.36\text{ N}0.36 N.
Calculate the length of the conductor in the magnetic field.