# Question 12.15: Repeat Example12.14 Z=(400−j300)Ω .

Repeat Example12.14  for $Z=(400-j 300) \Omega$ .

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Question: 12.43

## In Fig. 12.38, i(t)=I1cos(ω1t)+I2cos(ω2t+θ) , where ω1≠ω2. Use superposition to obtain an expression for the voltage ν . ...

Let  \tilde{I}_1=I_1 \angle 0, \tilde{I}_2=...
Question: 12.41

## Refer to Fig. 12.53. Express the average power dissipated in the load RL as a function of RL and the other circuit parameters. Let the frequency of the source be f=30kHz and draw a graph of the power dissipated in the load versus the load resistance RL, for 1Ω≤RL≤10kΩ. Use a logarithmic scale for ...

We first obtain the Thévenin equivalent for the ci...
Question: 12.49

## Design a gyrator-based tuned circuit subject to the following specifications: resonant frequency =f0=400Hz , quality factor =Q=10, impedance at resonance =Z0=100Ω. ...

We assume a suitable op amp is available (which is...
Question: 12.50

## The temperature coefficient for a certain 10kΩ  resistor is  500 ppm  at 20°C . Construct a graph showing resistance versus temperature  T  for  20°C≤T≤200°C , expressed as a percent of the nominal resistance. ...

The resistance as a function of temperature is giv...
Question: 12.48

## A manufacturer’s specifications for one of his offerings are L=22μHQ=50,fT=2.52MHz , and SRF=13MHz . (a) What is the ac resistance of the coil at the operating frequency? (b) What (approximately) is the shunt (stray) capacitance of the coil? ...

(a)   \begin{aligned} Q &=\frac{\omega_...
Question: 12.47

## In Fig. 12.69, RL=2.2kΩ and νS=VS[cos(ω1t)+cos(ω2t)] with f1=100kHz and f2=200 kHz. The circuit is intended to block the 200 kHz component and pass the 100 kHz component of the source voltage. You have available a selection of 200 and 100 kHz coils with inductances ranging from 10 to 200 ...

The impedance of a series RLC circuit is minimum a...
Question: 12.46

## btain an expression for the resonant frequency of the circuit shown in Fig. 12.65 ...

We may ignore the resistor $R_1$ be...
Question: 12.45

## Refer to Fig. 12.63. Draw a qualitative phasor diagram for the currents IR,IL,IC when the frequency of the sinusoidal source equals the resonant frequency of the parallel L C portion of the circuit. Use the source current I for the phase reference. ...

Because $\tilde{I}$ is the phase refe...
Question: 12.52