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physics
electricity and magnetism

Questions and Answers of Electricity and Magnetism

Determine the maximum power delivered to the variable resistor R shown in the circuit of Fig. 4.136?
For the circuit in Fig. 4.137, what resistor connected across terminals a-b will absorb maximum power from the circuit? What is that power?
(a) For the circuit in Fig. 4.138, obtain the Thevenin equivalent at terminals a-b.(b) Calculate the current in RL = 8(.(c) Find RL for maximum power deliverable to RL.(d) Determine that maximum
Determine the maximum power that can be delivered to the variable resistor R in the circuit of Fig. 4.139?
For the bridge circuit shown in Fig. 4.140, find the load RL for maximum power transfer and the maximum power absorbed by the load.
For the circuit in Fig. 4.141, determine the value of R such that the maximum power delivered to the load is 3 mW?
Solve Prob. 4.34 using PSpice.Chapter 4, Problem 34.Find the Thevenin equivalent at terminals a-b of the circuit in Fig. 4.98?
For the circuit in Fig. 4.111, obtain the Thevenin equivalent as seen from terminals(a) a-b(b) b-c
Use PSpice to solve Prob. 4.52.Chapter 4, Problem 52.For the transistor model in Fig. 4.111, obtain the Thevenin equivalent at terminals a-b.
Obtain the Thevenin equivalent of the circuit in Fig. 4.123 using PSpice?
Using superposition, find Vo in the circuit of Fig. 4.76.Figure 4.76 For Prob. 4.8.
Use PSpice to find the Thevenin equivalent circuit at terminals a-b of the circuit in Fig.4.125?
For the circuit in Fig. 4.126, use PSpice to find the Thevenin equivalent at terminals a-b?
A battery has a short-circuit current of 20 A and an open-circuit voltage of 12 V. If the battery is connected to an electric bulb of resistance 2 Ω, calculate the power dissipated by the bulb?
The following results were obtained from measurements taken between the two terminals of a resistive network.Find the Thevenin equivalent of the network?
When connected to a 4-Ω resistor, a battery has a terminal voltage of 10.8 V but produces 12 V on open circuit. Determine the Thèvenin equivalent circuit for the battery?
The Thevenin equivalent at terminals a-b of the linear network shown in Fig. 4.142 is to be determined by measurement. When a 10-kr/ resistor is connected to terminals a-b, the voltage Vab is
A black box with a circuit in it is connected to a variable resistor. An ideal ammeter (with zero resistance) and an ideal voltmeter (with infinite resistance) are used to measure current and voltage
A transducer is modeled with a current source Is and a parallel resistance Rs. The current at the terminals of the source is measured to be 9.975 mA when an ammeter with an internal resistance of 20
Consider the circuit in Fig. 4.144. An ammeter with internal resistance Ri is inserted between A and B to measure Io. Determine the reading of the ammeter if: (a) Ri = 500 Î©, (b) Ri = 0
Consider the circuit in Fig. 4.145. (a) Replace the resistor RL by a zero resistance ammeter and determine the ammeter reading. (b) To verify the reciprocity theorem, interchange the ammeter and the
Use superposition to find vo in the circuit of Fig. 4.77.Figure 4.77 For Prob. 4.9.
(a) In the Wheatstone bridge circuit of Fig. 4.147 select the values of R1 and R3 such that the bridge can measure Rx in the reange of 0-10 Î©.(b) Repeat for the range of 0-100(.
Consider the bridge circuit of Fig. 4.148. Is the bridge balanced? If the 10 Î© resistor is replaced by an 18-kÎ© resistor, what resistor connected between terminals a-b absorbs
The circuit in Fig. 4.149 models a common-emitter transistor amplifier. Find ix using source transformation?
An attenuator is an interface circuit that reduces the voltage level without changing the output resistance.(a) By specifying Rs and Rp of the interface circuit in Fig. 4.150, design an attenuator
A dc voltmeter with a sensitivity of 20 k(/V is used to find the Thevenin equivalent of a linear network. Readings on two scales are as follows: (c) 0-10 V scale: 4 V (d) 0-50 V scale: 5 V Obtain the
A resistance array is connected to a load resistor R and a 9-V battery as shown in Fig.4.151.(e) Find the value of R such that vo = 1.8 V.(f) Calculate the value of R that will draw the maximum
A common-emitter amplifier circuit is shown in Fig. 4.152. Obtain the Thevenin equivalent to the left of points B and E.
For Practice Prob. 4.18, determine the current through the 40-( resistor and the power dissipated by the resistor?
The equivalent model of a certain op amp is shown in Fig. 5.43. Determine:(a) The input resistance.(b) The output resistance.(c) The voltage gain in dB.
Find the gain vo/vs of the circuit in Fig. 5.49.
Find vo and io in the circuit in Fig. 5.50.
Find vo and io in the circuit of Fig. 5.52.
Determine the output voltage vo in the circuit of Fig. 5.53?
(a). Determine the ratio vo/is in the op amp circuit of Fig. 5.54.(b).Evaluate the ratio for R1 = 20 kÎ©, R2 = 25 kÎ©, R3 = 40 2kOmega$.
Obtain ix and iy in the op amp circuit in Fig. 5.55.
Calculate the gain vo/vi when the switch in Fig. 5.56 is in:(a) position 1 (b) position 2 (c) position 3
For the circuit in Fig. 5.57, find the Thevenin equivalent to the left of terminals a-b. Then calculate the power absorbed by the 20-kÎ© resistor. Assume that the op amp is ideal.
Determine io in the circuit of Fig. 5.58.
In the circuit in Fig. 5.59, calculate vo if vs = 0.
Calculate vo in the op amp circuit of Fig. 5.60.
For the op amp circuit in Fig. 5.61, find the voltage gain vo/vs?
In the circuit shown in Fig. 5.62, find k in the voltage transfer function vo = kvs?
Calculate vo in the op amp circuit of Fig. 5.63.
Determine io in the circuit of Fig. 5.64.
Find vo in the op amp circuit in Fig. 5.65.
Find io in the op amp circuit of Fig. 5.66?
Determine the voltage gain vo/v1 of the op amp circuit in Fig. 5.67?
In the circuit shown in Fig. 5.68, find ix and the power absorbed by the 20-Î© resistor.
For the circuit in Fig. 5.69, find ix.
Calculate ix and vo in the circuit of Fig. 5.70. Find the power dissipated by the 60-kÎ© resistor.
Refer to the op amp circuit in Fig. 5.71. Calculate ix and the power dissipated by the 3-kÎ© resistor.
Given the op amp circuit shown in Fig. 5.72, express vo in terms of v1 of v2.
For the circuit shown in Fig. 5.73, find the ThÃ¨venin equivalent at terminals a-b. (To find RTh, apply a current source io and calculate vo).
Determine the output of the summing amplifier in Fig. 5.74.
Calculate the output voltage due to the summing amplifier shown in Fig. 5.75.
For the op amp circuit in Fig. 5.76, determine the value of v in order to make 2vo = -16.5 V.
The output voltage of an op amp is .4 V when the noninverting input is 1 mV. If the open-loop gain of the op amp is 2 × 106, what is the inverting input?
Find vo in terms of v1, v2 and v3, in the circuit of Fig. 5.77?
An averaging amplifier is a summer that provides an output equal to the average of the inputs. By using proper input and feedback resistor values, one can getUsing a feedback resistor of 10 kÎ©,
A four input summing amplifier has R1 = R2 = R3 = R4 12k(. What value of feedback resistor is needed to make it an averaging amplifier?
Show that the output voltage vo of the circuit in Fig. 5.78 is
Design an op amp circuit to perform the following operation: Vo = 3v1 - 2v2 All resistance must be ( 100 k(.
Using only two op amps, design a circuit to solve - Vout = v1 - v2 / 3 v3 / 2
The circuit in Fig. 5.79 is for a difference amplifier. Find vo given that v1 = 1V and v2 = 2V.
The circuit in Fig. 5.80 is a differential amplifier driven by a bridge. Find vo.
Design a difference amplifier to have a gain of 2 and a common mode input resistance of 10 kΩ at each input?
For the op amp circuit of Fig. 5.44, the op amp has an open-loop gain of 100,000, an input resistance of 10 kÎ©, and an output resistance of 100 Î©. Find the voltage gain vo/vi
Design a circuit to amplify the difference between two inputs by 2. (a) Use only one op amp. (b) Use two op amps?
Using two op amps, design a subtractor?
Design an op amp circuit such that vo = - 2v1 + 4v2 - 5v3 - v4 Let all the resistors be in the range of 5 to 100 k(?
The ordinary difference amplifier for fixed-gain operation is shown in Fig. 5.81(a). It is simple and reliable unless gain is made variable. One way of providing gain adjustment without losing
Determine the voltage transfer ratio vo/vs in the op amp circuit of Fig. 5.82, where R =10 kÎ©.
In a certain electronic device, a three-stage amplifier is desired, whose overall voltage gain is 42 dB. The individual voltage gains of the first two stages are to be equal, while the gain of the
Find vo in the op amp circuit of Fig. 5.84?
Calculate io in the op amp circuit of Fig. 5.85.
In the op amp circuit of Fig. 5.86, determine the voltage gain vo/vs. Take R = 10 k(?
Using the same parameter for the 741 op amp in Example 5.1, find vo in the op amp circuit of Fig. 5.45.Example 5.1A 741 op amp has an open-loop voltage gain of 2Ã—105, input resistance of 2 MÎ©,
Calculate vo/v1 in the op amp circuit in Fig. 5.87.
Determine vo in the circuit of Fig. 5.88?
Obtain the closed-loop voltage gain vo/vt of the circuit in Fig. 5.89?
Determine the gain vo/vi of the circuit in Fig. 5.90?
For the op amp circuit shown in Fig. 5.91, find vo/vs?
Find vo in the op amp circuit of Fig. 5.92?
Find vo in the circuit in Fig. 5.95, assuming that Rf = ˆž (open circuit).
Repeat the previous problem if Rf = 10 kÎ©.5.68 find vo in the circuit in Fig. 5.93, assuming that Rf = ˆž (open circuit).
The op amp in Fig. 5.46 has Ri = 100 kÎ©, Ro = 100 Î©, A = 100,000. Find the differential voltage vd and the output voltage vo.
Determine vo in the op amp circuit of Fig. 5.96?
Determine vo in the op amp circuit in Fig. 5.97.?
Find the load voltage vL in the circuit of Fig. 5.98?
Determine the load voltage vL in the circuit of Fig. 5.99?
Find io in the op amp circuit of Fig. 5.100?
Rework Example 5.11 using the nonideal op amp LM324 instead of uA741.Example 5.11 - Use PSpice to solve the op amp circuit for Example 5.1.
Solve Prob. 5.19 using PSpice and op amp uA741.5.19 Determine io in the circuit of Fig. 5.57.
Solve Prob. 5.48 using PSpice and op amp LM324.5.48 The circuit in Fig. 5.78 is a differential amplifier driven by a bridge. Find vo?
Use PSpice to obtain vo in the circuit of Fig. 5.101?
Determine vo in the op amp circuit of Fig. 5.102 using PSpice.
Obtain vo for each of the op amp circuits in Fig. 5.47.
Use PSpice to solve Prob. 5.61?

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