Physics: Principles with Applications (7th Edition)

Published by Pearson
ISBN 10: 0-32162-592-7
ISBN 13: 978-0-32162-592-2

Chapter 18 - Electric Currents - Problems - Page 521: 15

Answer

Yes, it is possible.

Work Step by Step

Use equation 18–3 to find the resistance. The cross-sectional area $A=\pi r^2=\frac{\pi d^2}{4}$. $$R=\rho\frac{\mathcal{l}}{A}=\rho\frac{4 \mathcal{l}}{\pi d^2}$$ $$R_W=R_{Cu}$$ $$\rho_{W}\frac{4 \mathcal{l}}{\pi d_{W}^2}=\rho_{Cu}\frac{4 \mathcal{l}}{\pi d_{Cu}^2}$$ $$d_W=d_{Cu}\sqrt{\frac{\rho_W}{\rho_{Cu}}}$$ $$d_W=(2.2mm)\sqrt{\frac{5.6\times10^{-8}\Omega \cdot m}{1.68\times10^{-8}\Omega \cdot m }}$$ $$=4.0mm$$ The diameter of the tungsten wire should be 4.0 mm.
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