A cylindrical copper rod of length L and cross-sectional area A is reformed to three times its original length with no change in volume. If the resistance between its ends was R before the change, then its resistance after the change is: a) 9R b) 3R c) 25R d) 5R e) 4R f) R

A cylindrical copper rod of length L and cross-sectional area A is reformed to three times its original length with no change in volume. If the resistance between its ends was R before the change, then its resistance after the change is: a) 9R b) 3R c) 25R d) 5R e) 4R f) R

Principles of Physics: A Calculus-Based Text

5th Edition

ISBN:9781133104261

Author:Raymond A. Serway, John W. Jewett

Publisher:Raymond A. Serway, John W. Jewett

Chapter21: Current And Direct Current Circuits

Section: Chapter Questions

Problem 6CQ: Use the atomic theory of matter to explain why the resistance of a material should increase as its...

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Question

A cylindrical copper rod of length L and cross-sectional area A is reformed to three times its
original length with no change in volume. If the resistance between its ends was R before the
change, then its resistance after the change is:
a) 9R
b) 3R
c) 25R
d) 5R
e) 4R
f) R
a
b
e
f

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