Question: In the circuit shown in Fig. Q28.13, when switch S is suddenly closed, the wire L is pulled toward the lower wire carrying currentI. Which

In the circuit shown in Fig. Q28.13, when switch S is suddenly closed, the wire L is pulled toward the lower wire carrying currentI. Which (a or b) is the positive terminal of the battery? How do you know?

Figure Q28.13

as S.

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