Conceptual Physics (12th Edition)

Published by Addison-Wesley
ISBN 10: 0321909100
ISBN 13: 978-0-32190-910-7

Chapter 23 - Think and Explain: 71

Answer

See below.

Work Step by Step

Your friend is connecting the positive terminal of his battery to the positive terminal of yours, and the negative terminal of his battery to the negative terminal of yours. By connecting the two batteries "in parallel", his battery effectively replaces yours, and drives current through your starting circuit.
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