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 35 - AC Circuits - Exercises and Problems - Page 1052: 15

Answer

$\rm 6\;V,\;8\;V$

Work Step by Step

The peak voltage for the resistor is given by $$V_R=IR\tag 1$$ and for the capacitor is given by $$V_C=IX_C$$ where $X_C=1/\omega C=1/2\pi f C$, so $$V_C= \dfrac{I}{2\pi f C}\tag 2$$ Now we need to find the peal current $I$ which is given by $$I=\dfrac{\varepsilon_0}{Z}$$ where $\varepsilon_0$ is the peak resource voltage, and $Z=\sqrt{X_C^2+R^2}$, so $$I=\dfrac{\varepsilon_0}{\sqrt{X_C^2+R^2}}$$ $$I=\dfrac{\varepsilon_0}{\sqrt{\left[\dfrac{1}{2\pi f C}\right]^2+R^2}}\tag 3$$ Plug (3) into (1) to get $V_R$; $$V_R=\dfrac{\varepsilon_0R}{\sqrt{X_C^2+R^2}} $$ Plug the known; $$V_R=\dfrac{(10)(150)} {\sqrt{\left[\dfrac{1}{2\pi (10\times 10^3)(80\times 10^{-9})}\right]^2+(150)^2}} $$ $$V_R=\color{red}{\bf 6.02}\;\rm V$$ Plug (3) into (2) to get $V_C$; $$V_C= \dfrac{1}{2\pi f C} \dfrac{\varepsilon_0}{\sqrt{\left[\dfrac{1}{2\pi f C}\right]^2+R^2}}$$ Plug the known; $$V_C= \dfrac{1}{2\pi (10\times 10^3)(80\times 10^{-9})} \dfrac{10}{\sqrt{\left[\dfrac{1}{2\pi (10\times 10^3)(80\times 10^{-9})}\right]^2+(150)^2}}$$ $$V_C=\color{red}{\bf 7.98}\;\rm V$$
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