Chapter 21, Problem 8MCP

A vertical bar moves horizontally at constant velocity through a uniform magnetic field, as shown in Figure 21.40. We observe that point b is at a higher potential than point a. We can therefore conclude that the magnetic field must have a component that is directed

Figure 21.40

Multiple-Choice Problem 8.

1. A.    vertically downward.
2. B.     vertically upward.
3. C.     perpendicular to the plane of the paper, outward.
4. D.    perpendicular to the plane of the paper, inward.