Chapter 20, Problem 9MCP

A metal bar connected by metal leads to the terminals of a battery hangs between the poles of a horseshoe magnet, as shown in Figure 20.53. Just after the switch S is closed, what will happen to the bar? (Hint: Recall that magnetic field lines point out of a north magnetic pole and into a south magnetic pole.)

Figure 20.53

Multiple-Choice Problem 9.

1. A.    It will be pushed upward, decreasing the tension in the leads.
2. B.     It will be pushed downward, increasing the tension in the leads.
3. C.     It will swing outward, away from the magnet.
4. D.    It will swing inward, into the magnet.