College Physics (7th Edition)

Published by Pearson
ISBN 10: 0-32160-183-1
ISBN 13: 978-0-32160-183-4

Chapter 17 - Electric Current and Resistance - Learning Path Questions and Exercises - Multiple Choice Questions - Page 617: 17

Answer

(b) it is cut in half

Work Step by Step

Resistance of cylindrical conductor is proportional to its length and inversely proportional to its area of cross-section which is proportional to square of its diameter. So when length is doubled, resistance also doubled and when diameter is doubled, resistance becomes one-fourth. So overall resistance is halved.
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