Conceptual Physics (12th Edition)

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

Chapter 24 - Think and Explain: 60

Answer

The diameter decreases.

Work Step by Step

When the field is strengthened, the proton is pulled into a tighter, smaller-diameter circular path. If the field were weakened, the proton would feel less force, and move in a straighter, larger-diameter path.
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