Physics for Scientists and Engineers: A Strategic Approach with Modern Physics (3rd Edition)

Published by Pearson
ISBN 10: 0321740904
ISBN 13: 978-0-32174-090-8

Chapter 32 - The Magnetic Field - Exercises and Problems - Page 960: 68

Answer

${\bf 2.0}\;\rm A$

Work Step by Step

The force exerted by the springs is equal to the magnetic force exerted on the current wire since it is now at rest. Thus, $$\sum F_x=F_{\rm springs}-F_{\rm magnetic}=0$$ $$ F_{\rm springs}=F_{\rm magnetic} $$ and since the two springs are identical, $F_{\rm springs}=2k\Delta x$, $$ 2k\Delta x=BIL $$ Solving for $I$ to find the current, $$I=\dfrac{2k\Delta x}{BL}$$ Plug the given; $$I=\dfrac{2(10)(0.01) }{(0.50)(0.20)}$$ $$I=\color{red}{\bf 2.0}\;\rm A$$
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