In Fig. 20.6, side 3 of the rectangular coil in the electric generator rotates about the axis at constant angular speed w. The figure with this problem shows side 3 by itself.

(a) First consider the right half of side 3. Although the speed of the wire differs depending on the distance from the axis, the direction is the same for the entire right half. Use the magnetic force law to find the direction of the force on electrons in the right half of the wire.
(b) Does the magnetic force tend to push electrons along the wire, either toward or away from the axis?
(c) Is there an induced emf along the length of this half of the wire?
(d) Generalize your answers to the left side of wire 3 and the two sides of wire 1. What is the net emf due to these two sides of the coil?

Axis