Problem 1RQ: An RC circuit has R = 2 and C = 4 F. The time constant is: (a)0.5 s (b)2 s (c)4 s (d)8 s15 s Problem 2RQ: The time constant for an RL circuit with R = 2 and L = 4 H is: (a)0.5 s (b)2 s (c)4 s (d)8 s15 s Problem 3RQ: A capacitor in an RC circuit with R = 2 and C = 4 F is being charged. The time required for the... Problem 4RQ: An RL circuit has R = 2 and L = 4 H. The time needed for the inductor current to reach 40 percent... Problem 5RQ: In the circuit of Fig. 7.79, the capacitor voltage just before t = 0 is: (a)10 V (b)7 V (c)6 V (d)4... Problem 6RQ: Figure 7.79 For Review Questions 7.5 and 7.6. 7.6In the circuit in Fig. 7.79, v() is: (a)10 V (b)7 V... Problem 7RQ: For the circuit in Fig. 7.80, the inductor current just before t = 0 is: (a)8 A (b)6 A (c)4 A (d)2... Problem 8RQ: Figure 7.80 For Review Questions 7.7 and 7.8. 7.8In the circuit of Fig. 7.80, i() is: (a)10 A (b)6 A... Problem 9RQ: If vs changes from 2 V to 4 V at t = 0, we may express vs as: (a) (t) V (b) 2u(t) V (c) 2u(t) +... Problem 10RQ: The pulse in Fig. 7.116(a) can be expressed in terms of singularity functions as: (a) 2u(t) + 2u(t ... Problem 1P: In the circuit shown in Fig. 7.81 v(t)=56e200tV,t0i(t)=8e200tmA,t0 (a)Find the values of R and C.... Problem 2P: Find the time constant for the RC circuit in Fig. 7.82. Figure 7.82 For Prob. 7.2. Problem 3P: Determine the time constant for the circuit in Fig. 7.83. Figure 7.83 For Prob. 7.3. Problem 4P: The switch in Fig. 7.84 has been in position A for a long time. Assume the switch moves... Problem 5P: Using Fig. 7.85, design a problem to help other students better understand source-free RC circuits.... Problem 6P: The switch in Fig. 7.86 has been closed for a long time, and it opens at t = 0. Find v(t) for t 0.... Problem 7P: Assuming that the switch in Fig. 7.87 has been in position A for a long time and is moved to... Problem 8P: For the circuit in Fig. 7.88, if v=10e4tVandi=0..2e4tA,t0 (a)Find R and C. (b)Determine the time... Problem 9P: The switch in Fig. 7.89 opens at t = 0. Find vo for t 0. Figure 7.89 For Prob. 7.9. Problem 10P: For the circuit in Fig. 7.90, find vo(t) for t 0. Determine the time necessary for the capacitor... Problem 11P: For the circuit in Fig. 7.91, find io for t 0. Figure 7.91 For Prob. 7.11. Problem 12P: Using Fig. 7.92, design a problem to help other students better understand source-free RL circuits.... Problem 13P: In the circuit of Fig. 7.93, v(t)=80e103tV,t0i(t)=5e103tmA,t0 (a) Find R, L, and . (b) Calculate the... Problem 14P: Calculate the time constant of the circuit in Fig. 7.94. Figure 7.94 For Prob. 7.14. Problem 15P: Find the time constant for each of the circuits in Fig. 7.95. Figure 7.95 For Prob. 7.15. Problem 16P: Determine the time constant for each of the circuits in Fig. 7.96. Figure 7.96 For Prob. 7.16. Problem 17P: Consider the circuit of Fig. 7.97. Find vo(t) if i(0) = 15 A and v(t) = 0. Figure 7.97 For Prob.... Problem 18P: For the circuit in Fig. 7.98, determine vo(t) when i(0) = 5 A and v(t) = 0. Figure 7.98 For Prob.... Problem 19P: In the circuit of Fig. 7.99, find i(t) for t 0 if i(0) = 5 A. Figure 7.99 Problem 20P: For the circuit in Fig. 7.100, v = 90e50t V and i = 30e50t A, t 0 (a) Find L and R. (b) Determine... Problem 21P: In the circuit of Fig. 7.101, find the value of R for which the steady-state energy stored in the... Problem 22P: Find i(t) and v(t) for t 0 in the circuit of Fig. 7.102 if i(0) = 10 A. Figure 7.102 Problem 23P: Consider the circuit in Fig. 7.103. Given that vo(0) = 10 V, find vo and vx for t 0. Figure 7.103 Problem 24P: Express the following signals in terms of singularity functions. (a) v t = 0 t0 5, t0 (b) i t = 0,... Problem 25P: Design a problem to help other students better understand singularity functions. Problem 26P: Express the signals in Fig. 7.104 in terms of singularity functions. Problem 27P: Express v(t) in Fig. 7.105 in terms of step functions. Problem 28P: Sketch the waveform represented by i(t) = [r(t) r(t 1) u(t 2) r(t 2) + r(t 3) + u(t)(t 4)] A Problem 29P: Sketch the following functions: (a) x(t) = 10etu(t 1), (b) y(t) = 10e(t1) u(t), (c) z(t) = cos 4t(t... Problem 30P Problem 31P: Evaluate the following integrals: (a)e4t2(t2)dt (b)[5(t)+e1(t)+cos2t(t)]dt Problem 32P Problem 33P: The voltage across a 10-mH inductor is 45(t 2)mV. Find the inductor current, assuming that the... Problem 34P: Evaluate the following derivatives: (a) ddtut1ut+1 (b) ddtrt6ut2 (c) ddtsin4tut3 Problem 35P: Find the solution to the following differential equations: (a)dvdt+2v=0,v(0)=1V (b)2didt3i=0,i(0)=2 Problem 36P: Solve for v in the following differential equations, subject to the stated initial condition. (a)... Problem 37P: A circuit is described by 4dvdt+v=10 (a) What is the time constant of the circuit? (b) What is v(),... Problem 38P: A circuit is described by didt+3i=2ut Find i(t) for t 0 given that i(0) = 0. Problem 39P: Calculate the capacitor voltage for t 0 and t 0 for each of the circuits in Fig. 7.106. Problem 40P: Find the capacitor voltage for t 0 and t 0 for each of the circuits in Fig. 7.107. Problem 41P: Using Fig. 7.108, design a problem to help other students better understand the step response of an... Problem 42P: (a) If the switch in Fig. 7.109 has been open for a long time and is closed at t = 0, find vo(t).... Problem 43P: Consider the circuit in Fig. 7.110. Find i(t) for t 0 and t 0. Problem 44P: The switch in Fig. 7.111 has been in position a for a long time. At t = 0, it moves to position b.... Problem 45P: Find vo in the circuit of Fig. 7.112 when vs = 30u(t) V. Assume that vo(0) = 5 V. Figure 7.112 Problem 46P Problem 47P: Determine v(t) for t 0 in the circuit of Fig. 7.114 if v(0) = 0. Figure 7.114 Problem 48P: Find v(t) and i(t) in the circuit of Fig. 7.115. Figure 7.115 Problem 49P: If the waveform in Fig. 7.116(a) is applied to the circuit of Fig. 7.116(b), find v(t). Assume v(0)... Problem 50P: In the circuit of Fig. 7.117, find ix for t 0. Let R1 = R2 = 1 k, R3 = 2 k, and C = 0.25 mF. Figure... Problem 51P: Rather than applying the shortcut technique used in Section 7.6, use KVL to obtain Eq. (7.60).... Problem 52P: Using Fig. 7.118, design a problem to help other students better understand the step response of an... Problem 53P: Determine the inductor current i(t) for both t 0 and t 0 for each of the circuits in Fig. 7.119.... Problem 54P: Obtain the inductor current for both t 0 and t 0 in each of the circuits in Fig. 7.120. Problem 55P: Find v(t) for t 0 and t 0 in the circuit of Fig. 7.121. Figure 7.121 For Prob. 7.55. Problem 56P Problem 57P Problem 58P: Rework Prob. 7.17 if i(0) = 10 A and v(t) = 20u(t) V. Consider the circuit of Fig. 7.97. Find vo(t)... Problem 59P: Determine the step response vo(t) to is = 6u(t) A in the circuit of Fig. 7.124. Figure 7.124 Problem 60P: Find v(t) for t 0 in the circuit of Fig. 7.125 if the initial current in the inductor is zero.... Problem 61P: In the circuit in Fig. 7.126, is changes from 5 A to 10 A at t = 0; that is, is = 5u(t) + 10u(t).... Problem 62P: For the circuit in Fig. 7.127, calculate i(t) if i(0) = 0. Figure 7.127 Problem 63P: Obtain v(t) and i(t) in the circuit of Fig. 7.128. Figure 7.128 For Prob. 7.63. Problem 64P: Determine the value of iL(t) and the total energy dissipated by the circuit from t = 0 sec to t = ... Problem 65P: If the input pulse in Fig. 7.130(a) is applied to the circuit in Fig. 7.130(b), determine the... Problem 66P: Using Fig. 7.131, design a problem to help other students better understand first-order op amp... Problem 67P: If v(0) = 10 V, find vo(t) for t 0 in the op amp circuit in Fig. 7.132. Let R = 100 k and C = 20 F.... Problem 68P Problem 69P: For the op amp circuit in Fig. 7.134, find vo(t) for t 0. Figure 7.134 Problem 70P: Determine vo for t 0 when vs = 20 mV in the op amp circuit of Fig. 7.135. Figure 7.135 Problem 71P: For the op amp circuit in Fig. 7.136, suppose vs = 10u(t) V. Find v(t) for t 0. Figure 7.136 Problem 72P: Find io in the op amp circuit in Fig. 7.137. Assume that v(0) = 2 V, R = 10 k, and C = 10 F. Figure... Problem 73P: For the op amp circuit of Fig. 7.138, let R1 = 10 k, Rf = 30 k, C = 20 F, and v(0) = 1 V. Find v0. Problem 74P: Determine vo(t) for t 0 in the circuit of Fig. 7.139. Let is = 10u(t) A and assume that the... Problem 75P: In the circuit of Fig. 7.140, find vo and io, given that vs = 10[1 et]u(t) V. Problem 76P: Repeat Prob. 7.49 using PSpice or MultiSim. If the waveform in Fig. 7.116(a) is applied to the... Problem 77P: The switch in Fig. 7.141 opens at t = 0. Use PSpice or MultiSim to determine v(t) for t 0. Figure... Problem 78P: The switch in Fig. 7.142 moves from position a to b at t = 0. Use PSpice or MultiSim to find i(t)... Problem 79P: In the circuit of Fig. 7.143, determine io(t). Figure 7.143 For Prob. 7.79. Problem 80P: In the circuit of Fig. 7.144, find the value of io for all values of 0 t. Problem 81P: Repeat Prob. 7.65 using PSpice or MultiSim. If the input pulse in Fig. 7.130(a) is applied to the... Problem 82P: In designing a signal-switching circuit, it was found that a 100-F capacitor was needed for a time... Problem 83P Problem 84P: A capacitor with a value of 10 mF has a leakage resistance of 2 M. How long does it take the voltage... Problem 85P: A simple relaxation oscillator circuit is shown in Fig. 7.145. The neon lamp fires when its voltage... Problem 86P: Figure 7.146 shows a circuit for setting the length of time voltage is applied to the electrodes of... Problem 87P: A 120-V dc generator energizes a motor whose coil has an inductance of 50 H and a resistance of 100... Problem 88CP: The circuit in Fig. 7.148(a) can be designed as an approximate differentiator or an integrator,... Problem 89CP: An RL circuit may be used as a differentiator if the output is taken across the inductor and T (say ... Problem 90CP: An attenuator probe employed with oscilloscopes was designed to reduce the magnitude of the input... Problem 91CP: The circuit in Fig. 7.150 is used by a biology student to study frog kick. She noticed that the frog... Problem 92CP: To move a spot of a cathode-ray tube across the screen requires a linear increase in the voltage... format_list_bulleted