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Chapter 14: Problem 2097
For high frequency, a capacitor offers (a) More reactance (b) Less reactance (c) Zero reactance (d) Infinite reactance
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The power factor of an ac circuit having resistance \((\mathrm{R})\) and inductance (L) connected in series and an angular velocity w is, (a) \((\mathrm{R} / \mathrm{cL})\) (b) $\left[\mathrm{R} /\left\\{\mathrm{R}^{2}+\omega^{2} \mathrm{~L}^{2}\right\\}^{(1 / 2)}\right]$ (c) \((\omega L / R)\) (d) $\left[\mathrm{R} /\left\\{\mathrm{R}^{2}-\omega^{2} \mathrm{~L}^{2}\right\\}^{(1 / 2)}\right]$
An LC circuit contains a \(20 \mathrm{mH}\) inductor and a \(50 \mu \mathrm{F}\) capacitor with an initial charge of \(10 \mathrm{mc}\). The resistance of the circuit is negligible. At the instant the circuit is closed be \(t=0 .\) At what time is the energy stored completely magnetic. (a) \(\mathrm{t}=0 \mathrm{~ms}\) (b) \(\mathrm{t}=1.54 \mathrm{~ms}\) (c) \(\mathrm{t}=3.14 \mathrm{~ms}\) (d) \(\mathrm{t}=6.28 \mathrm{~ms}\)
The diagram shows a capacitor \(\mathrm{C}\) and resistor \(\mathrm{R}\) connected in series to an ac source. \(\mathrm{V}_{1}\) and \(\mathrm{V}_{2}\) are voltmeters and \(\mathrm{A}\) is an ammeter, consider the following statements.(a) Readings in \(\mathrm{A}\) and \(\mathrm{V}_{2}\) are always in phase. (b) Reading in \(\mathrm{V}_{1}\) is ahead in phase with reading in \(\mathrm{V}_{2}\). (c) Reading in \(\mathrm{A}\) and \(\mathrm{V}_{1}\) are always in phase. (d) Which of these statements are is correct (a) 1) only (b) 2) only (c) 1 ) and 2) only (d) 2 ) and 3) only
Two similar circular loops carry equal currents in the same direction. On moving the coils further apart, the electric current will (a) Remain unchanged (b) Increasing in both (c) Increasing in one decreasing in other (d) Decreasing in both
A resistor \(30 \Omega\), inductor of reactance \(10 \Omega\) and the capacitor of reactance \(10 \Omega\) are connected in series to an ac voltage source \(\mathrm{e}=300 \sqrt{2} \sin (\omega \mathrm{t})\) The current in the circuit is (a) \(10 \sqrt{2 \mathrm{~A}}\) (b) \(10 \mathrm{~A}\) (c) \(30 \sqrt{11 \mathrm{~A}}\) (d) \((30 / \sqrt{11}) \mathrm{A}\)
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