Answer
a. $R=20\Omega$
b. $R=2.5\Omega$
Work Step by Step
Given $R=\rho\times\frac{L}{A}$
a. If length is doubled, resistance doubles.
b. If diameter doubles, radius doubles, so area is divided by 4.
Electrical Engineering: Principles & Applications (6th Edition)
by Hambley, Allan R.
Published by
Prentice Hall
ISBN 10:
0133116646
ISBN 13:
978-0-13311-664-9
Chapter 1 - 1.6 - Problems - Introduction to Circuit Elements - Page 40: P1.55
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