Physics for Scientists and Engineers with Modern Physics, Technology Update
9th Edition
ISBN: 9781305401969
Author: SERWAY, Raymond A.; Jewett, John W.
Publisher: Cengage Learning
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Chapter 28, Problem 6CQ
To determine
The condition when switch is closed.
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A parallel plate capacitor has an air-filled gap. It is attached an EMF and charged it to charge Qo and voltage difference ΔVco. Two different experiments are done.
Case A: The gap between the capacitor plates is then filled with Teflon with the capacitor still connected directly across the terminals of the EMF.
Case B: The capacitor is disconnected from the EMF first before the gap in between the plates is then filled with Teflon.
Which statement is true after the Teflon is inserted into the gap?
1.) In case A, ΔVc is unchanged but Q increases to keep the net E field between the plates unchanged. In case B, Q is unchanged but ΔVc decreases due to a smaller net E field between the plates.
2.) In case A, Q is unchanged but ΔVc decreases due to a smaller net E field between the plates. In case B, ΔVc is unchanged but Q increases to keep the net E field between the plates unchanged.
3.) In case A, Q is unchanged but ΔVc increases due to a larger net E field between the plates. In case…
4. The circuit contains four parallel plate capacitors, all initially uncharged and with no dielectric material between their plates. A switch is closed to complete the circuit at time t=0, so current begins to flow at that time and we wait enough time for the capacitors to become (very close to) fully charged.
a. What is the equivalent capacitance of this circuit?
b. What is the charge stored on the 125 µF capacitor?
If we now insert a neoprene rubber dielectric into all of the capacitors, how will the answers change?
c. What is the equivalent capacitance of this circuit?
d. What is the charge stored on the 125 µF capacitor?
You are working as a demonstration assistant for a physicsprofessor. He shows you the circuit in Figure P31.14, whichhe wants you to build for an upcoming class. The lightbulbis a household incandescent bulb that receives energy at therate of 40.0 W when operating at 120 V. It has a resistanceR1, which, for simplicity, we will assume is constant at alloperating voltages. The battery in the circuit has an emf of12.0 V. When the switch has been closed for a long time, thebulb glows dimly, since it is powered by only 12.0 V. Whenthe switch is opened, however, the bulb flashes brightly andthen gradually dims to darkness. Your professor wants youto determine two values: (a) the resistance R2 that is necessaryfor the bulb to initially flash, when the switch is opened,at the same brightness it would have if plugged into a 120-Vsocket; (b) the inductance L necessary to keep the currentin the lightbulb above 50.0% of its value when the switchis opened, for a time interval of 2.00 s after it is…
Chapter 28 Solutions
Physics for Scientists and Engineers with Modern Physics, Technology Update
Ch. 28.1 - To maximize the percentage of the power from the...Ch. 28.2 - With the switch in the circuit of Figure 27.4a...Ch. 28.2 - With the switch in the circuit of Figure 27.6a...Ch. 28.2 - Prob. 28.4QQCh. 28.4 - Consider the circuit in Figure 27.17 and assume...Ch. 28 - Prob. 1OQCh. 28 - Prob. 2OQCh. 28 - Prob. 3OQCh. 28 - Prob. 4OQCh. 28 - Prob. 5OQ
Ch. 28 - Prob. 6OQCh. 28 - Prob. 7OQCh. 28 - Prob. 8OQCh. 28 - Prob. 9OQCh. 28 - Prob. 10OQCh. 28 - Prob. 11OQCh. 28 - Prob. 12OQCh. 28 - Prob. 13OQCh. 28 - Prob. 14OQCh. 28 - Prob. 15OQCh. 28 - Prob. 1CQCh. 28 - Prob. 2CQCh. 28 - Why is it possible for a bird to sit on a...Ch. 28 - Prob. 4CQCh. 28 - Prob. 5CQCh. 28 - Prob. 6CQCh. 28 - Prob. 7CQCh. 28 - Prob. 8CQCh. 28 - Is the direction of current in a battery always...Ch. 28 - Prob. 10CQCh. 28 - Prob. 1PCh. 28 - Two 1.50-V batterieswith their positive terminals...Ch. 28 - An automobile battery has an emf of 12.6 V and an...Ch. 28 - Prob. 4PCh. 28 - Prob. 5PCh. 28 - Prob. 6PCh. 28 - Prob. 7PCh. 28 - Prob. 8PCh. 28 - Prob. 9PCh. 28 - Prob. 10PCh. 28 - Prob. 11PCh. 28 - Prob. 12PCh. 28 - Prob. 13PCh. 28 - Prob. 14PCh. 28 - Prob. 15PCh. 28 - Prob. 16PCh. 28 - Prob. 17PCh. 28 - Prob. 18PCh. 28 - Prob. 19PCh. 28 - Why is the following situation impossible? A...Ch. 28 - Prob. 21PCh. 28 - Prob. 22PCh. 28 - Prob. 23PCh. 28 - Prob. 24PCh. 28 - Prob. 25PCh. 28 - The following equations describe an electric...Ch. 28 - Prob. 27PCh. 28 - Prob. 28PCh. 28 - Prob. 29PCh. 28 - Prob. 30PCh. 28 - Prob. 31PCh. 28 - Prob. 32PCh. 28 - Prob. 33PCh. 28 - Prob. 34PCh. 28 - Prob. 35PCh. 28 - Prob. 36PCh. 28 - An uncharged capacitor and a resistor are...Ch. 28 - Prob. 38PCh. 28 - Prob. 39PCh. 28 - A 10.0-F capacitor is charged by a 10.0-V battery...Ch. 28 - Prob. 41PCh. 28 - Prob. 42PCh. 28 - Prob. 43PCh. 28 - Prob. 44PCh. 28 - A charged capacitor is connected to a resistor and...Ch. 28 - Prob. 46PCh. 28 - Prob. 47PCh. 28 - Prob. 48PCh. 28 - Prob. 49APCh. 28 - Prob. 50APCh. 28 - Prob. 51APCh. 28 - Prob. 52APCh. 28 - Prob. 53APCh. 28 - Prob. 54APCh. 28 - Prob. 55APCh. 28 - Prob. 56APCh. 28 - Prob. 57APCh. 28 - Why is the following situation impossible? A...Ch. 28 - Prob. 59APCh. 28 - Prob. 60APCh. 28 - When two unknown resistors are connected in series...Ch. 28 - Prob. 62APCh. 28 - Prob. 63APCh. 28 - A power supply has an open-circuit voltage of 40.0...Ch. 28 - Prob. 65APCh. 28 - Prob. 66APCh. 28 - Prob. 67APCh. 28 - Prob. 68APCh. 28 - Prob. 69APCh. 28 - Prob. 70APCh. 28 - Prob. 71APCh. 28 - Prob. 72APCh. 28 - A regular tetrahedron is a pyramid with a...Ch. 28 - An ideal voltmeter connected across a certain...Ch. 28 - Prob. 75APCh. 28 - Prob. 76APCh. 28 - Prob. 77APCh. 28 - Prob. 78APCh. 28 - Prob. 79APCh. 28 - Prob. 80APCh. 28 - Prob. 81APCh. 28 - Prob. 82CPCh. 28 - Prob. 83CP
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- The switch in Figure P27.51a closes when Vc23Vand opens when Vc13V. The ideal voltmeter reads a potential difference as plotted in Figure P27.51b. What is the period T of the waveform in terms of R1, R2, and C? Figure P27.51arrow_forwardA parallel plate capacitor has surface dimension of 40.0 cm x 20.0 cm. The capacitor is connected to a dc power supply of 50.0 V and a material with = 200 is inserted in between the plates. If the capacitance of the capacitor is 18 F, find a. the pate separation, d in meterb. the energy density of this capacitor, u in Joule per cubic meterarrow_forwardYou are working as a demonstration assistant for a physics professor. He shows you the circuit in Figure P31.14, which he wants you to build for an upcoming class. The lightbulb is a household incandescent bulb that receives energy at the rate of 40.0 W when operating at 120 V. It has a resistance Ry, which, for simplicity, we will assume is constant at all operating voltages. The battery in the circuit has an emf of 12.0 V. When the switch has been closed for a long time, the bulb glows dimly, since it is powered by only 12.0 V. When the switch is opened, however, the bulb flashes brightly and then gradually dims to darkness. Your professor wants you to determine two values: (a) the resistance R, that is neces- sary for the bulb to initially flash, when the switch is opened, at the same brightness it would have if plugged into a 120-V socket; (b) the inductance L necessary to keep the current in the lightbulb above 50.0% of its value when the switch is opened, for a time interval of…arrow_forward
- #M02arrow_forward51. The switch in Figure P27.51a closes when A,>AV_and opens when AV,arrow_forwardProblem #2: Maxwell's Equations. Consider the RC circuit shown. It consists of: an ideal 18 V battery, E a 30 resistor, and a 15 mF capacitor. R The capacitor consists of two circular plates separated by a small distance. Each plate has radius R € 0.46 m. The capacitor is initially uncharged. GH = At time t = 0, the switch is closed. с 3. How fast is the electric flux between the capacitor plates changing at the instant the switch is closed? S 4. When the current through the resistor is 0.40 A, what is the magnetic field at point H, a distance of 0.35 m from the center of the capacitor?arrow_forwardProblem 8: A capacitor has a potential difference of Vo = 370 V between the plates. When the switch S is closed, it is discharged through a resistor of R = 10.5 k2. At time t = 10 seconds after the switch is closed, the potential difference between the capacitor plates equals Vc = 1.0 V. S Randomized Variables Vo = 370 V R = 10.5 k2 Part (a) Calculate the capacitance of the capacitor in farads. Numeric : A numeric value is expected and not an expression. C = Part (b) Calculate the maximum current Imax that passes through the resistor, in Amperes. Numeric : A numeric value is expected and not an expression. Imax = Part (c) Calculate the current I at time t, in Amperes. Numeric : A numeric value is expected and not an expression. I =arrow_forwardR1 S R3. R2 4. Determine in the current in each resistor given that R1 = R2 = R3 = 12, the capacitance C = 0.5 µF, and potential across the batter of E = 2V when the switch is closed at t = 0. Determine then after some time (t = x) after the switch is closed the currents in each resistor.arrow_forwardQ1 Charging Capacitor At t= 0, S is closed to the A position. The capacitor begins to charge. Find the Time Rates at which: a) Charge is accumulating on the capacitor b) Energy is being stored in the capacitor c) Thermal energy is being dissipated through the resistor d) Energy is being delivered by the seat of emf. e) Evaluate for t = 1.0 s, R = 3.0 MN, C = 1.0µF, ε = 4.0 V 3 B www R 4|1|* 3 www R +q -qarrow_forwardQ (t) = 3e-0.7t sin() + 0.01 sin(4t) - 0.02 cos(4t) The function Q defined above models the electric charge, measured in coulombs, inside a lightbulb t seconds after it is turned on. Which of the following presents the method for finding the instantaneous rate of change of the lightbulb's electric charge, in coulombs per second, at time t = 4? Q" (4) = -0.213 A B C D Q'(4) = -0.171 Q(4) Q (0) 4-0 = 0.053 Q (4) = 0.194arrow_forwardVin Vout 1601 ww R2 R1 VR 30100555 -9870479447 In the circuit in the figure, 160 100559 If VR=6V RI=8k and R2=4k; g160100555 - 987047944/ 087047944/ g160100555 - 987047944/ a. At what value of the input voltage does the output signal change from 047944 o87047944 60555 At what value of the input voltage does the output signal change from negative saturation to positive saturation? g160100555 - 987047944/ 047944 1-18V sources. 555 g160100555- g160100558 047944 g160100555 - 987047944 g16t 047944 positive saturation to negative saturation? 556 g160100555- 047944 p0555-arrow_forwardC, O. (A) (B) Figure 4: 4. The energy stored in a capacitor is U = = }CV² = }Qv. The energy per unit volume for a vacuum filled capacitor is up = tco E². If the electric field is constant within the capacitor of volume I the energy stored follows as U = u pT. If the electric field is not constant then U = | drup. It follows that for a parallel plate capacitor with area A = 100cm2 and plate separation h = lem connected to a battery of voltage V = 5000V olts the energy stored is[ignore the fringing] U = ugT = }60E²+ = }co¥ Ah = }co A = 0.111mJ and therefore the magnitude of the force on one plate is F = = }o A = 11.1mN (True,False)arrow_forwardarrow_back_iosSEE MORE QUESTIONSarrow_forward_ios
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