In the circuit shown in Fig. Q28.13, when switch S is suddenly closed, the wire L is

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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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University Physics with Modern Physics

ISBN: 978-0133977981

14th edition

Authors: Hugh D. Young, Roger A. Freedman

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