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 33 - Electromagnetic Induction - Exercises and Problems - Page 1001: 69

Answer

${\bf 1.0}\;\rm \mu F$

Work Step by Step

Recalling that the dynamics of the charge on the capacitor in $LC$-circuits is given by $$Q=Q_0\cos(\omega t)$$ so the current in this circuit is given by $$I=-\dfrac{ dQ}{dt}=-\dfrac{d}{dt}Q_0\cos(\omega t)$$ $$I= Q_0\omega \sin(\omega t)$$ where $Q_0 \omega =I_0$ where $I_0$ is the maximum current. Hence, $$I_0= Q_0 \omega $$ when $Q_0=(\Delta V_C)_{\rm max} C$, and $\omega=\sqrt{1/LC}$, $$I_0=\dfrac{ (\Delta V_C)_{\rm max} C}{\sqrt{LC}} $$ $$I_0=\dfrac{ (\Delta V_C)_{\rm max} \sqrt{C}}{\sqrt{L }} $$ Solving for $C$, $$C=\left[\dfrac{I_0\sqrt{L}}{(\Delta V_C)_{\rm max}}\right]^2$$ Plug the known; $$C=\left[\dfrac{(0.60)\sqrt{(10\times 10^{-3})}}{(60)}\right]^2$$ $$C=\color{red}{\bf 1.0}\;\rm \mu F$$
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