GREPhysics.NET: GR0177 #38

GR0177 #38

Problem

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Electromagnetism $\Rightarrow$ }AC Circuit

The current is maximized when one has resonance. Resonance occurs when the complex impedance is 0, or when $X_L=X_C \Rightarrow \omega L = 1/(\omega C)$ . Plug stuff in to get choice (D).

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Comments

giga17 2010-08-11 02:06:05	This is one of those problems where dimensional analysis would help a lot. The only way to get a time scale out of the physical quantities from R, L and C is 1/ $\sqrt{LC}$ . Reply to this comment
zmb_hep 2009-09-08 15:36:21	One can also use the resonant frequency condition $\omega_0$ =1/ $\sqrt{LC}$ . We are given that $\omega_0$ =10^3 , and that L=25 mH, plugging these values in and solving for C also gives the correct answer Reply to this comment

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