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A circuit consists of three identical lamps connected to a battery as in Figure OQ28.14. The battery has some internal resistance. The switch S, originally open, is closed. (i) What then happens to the brightness of lamp B? (a) It increases. (b) It decreases somewhat. (c) It does not change. (d) It drops to zero. For parts (ii) to (vi), choose from the same possibilities (a) through (d). (ii) What happens to the brightness of lamp C? (iii) What happens to the current in the battery? (iv) What happens to the potential difference across lamp A? (v) What happens to the potential difference across lamp C? (vi) What happens to the total power delivered to the lamps by the battery?
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Chapter 28 Solutions
Physics for Scientists and Engineers, Technology Update (No access codes included)
- The- pair of capacitors in Figure P28.63 are fully charged by a 12.0-V battery. The battery is disconnected, and the switch is then closed. Alter 1.00 ms has elapsed, (a) how much charge remains 011 the 3.00-F capacitor? (b) How much charge remains on the 2.00-F capacitor? (c) What is the current in the resistor at this time?arrow_forwardConsider a series RC circuit as in Figure P28.38 for which R = 1.00 M, C = 5.00 F, and = 30.0 V. Find (a) the time constant of the circuit and (b) the maximum charge on the capacitor after the switch is thrown closed. (c) Find the current in the resistor 10.0 s after the switch is closed.arrow_forwardA 10 MΩ resistor is connected in series with a 1.0 μF capacitor and a battery with emf 12.0 V. Before the switch is closed at time t=0,the capacitor is uncharged. What fraction of the final charge Qf is on the capacitor at t=10s?arrow_forward
- 82. Switch S in is closed at time t 30, to begin charging an initially uncharged capacitance C= 15.0 µF through a resistor of resistance R = 20.0 Q. %3D S. cаpacitor of R %3D At what time is the potential across the capacitor equal to that across the resistor?arrow_forwardWhat is the time constant of the circuit shown in Figure OQ28.7? Each of the five resistors has resistance R. and each of the five capacitors has capacitance C. The internal resistance of the battery is negligible. (a) RC. (b) 5RC. (c) 10RC (d) 25RC (e) none of those answersarrow_forwardIn the circuit shown both capacitors are initially charged to 45.0 V. (a) How long after closing the switch S will the potential across each capacitor be reduced to 10.0 V, and (b) what will be the current at that time? 15.0 20.0 50.0 N µF µF 30.0 Narrow_forward
- In the circuit shown in Figure OQ28.12, each battery is delivering energy to the circuit by electrical transmission. All the resistors have equal resistance. (i) Rank the electric potentials at points a, b. c, d, and e from highest to lowest, noting any cases of equality in the ranking. (ii) Rank the magnitudes of the currents at the same points from greatest to least, noting any cases of equality.arrow_forwardSwitch S in in the figure is closed at time t = 0, to begin charging an initially uncharged capacitor of capacitance C = 17.9 µF through a resistor of resistance R = 22.8 2. At what time is the potential across the capacitor equal to that across the resistor? Number i 0 Units H S W m R ◄► сarrow_forwardJerry sticks Tom’s tail in an electrical socket (Vrms = 115 V at 60 Hz). Ini-tially, we can think of Tom’s tail as a single 22 kΩ resistor connected to the floor by hislegs. His hind legs are 65 kΩ resistors and his front legs are 55 kΩ resistors. (His bodyhas no resistance, and the floor is connected to a ground wire in the socket, which com-pletes the circuit with no additional resistance.)a) How much power is dissipated in Tom, on average? b) Now Tom jumps in the air as a result of the shock. This makes him equivalent to aparallel-plate capacitor with an area of 40.0 cm2 (the total area of his paws) and a spac-ing of 6.0 cm. What is his capacitance? c) This capacitance can be thought of as in series with the total resistance you deter-mined in part a). Now how much current (rms) goes through Tom, and what is thephase shift of this current with respect to the emf?d) Tom is already planning to use a solenoid in self-defense as in Episode 3. Whatshould its inductance be so that the…arrow_forward
- The circuit in Figure P18.62 contains two resistors, R1 = 2.0kΩ and R2 = 3.0 kΩ, and two capacitors, C1 = 2.0 µF and C2 =3.0 µF, connected to a battery with emf ε = 120 V. If there areno charges on the capacitors before switch S is closed, determinethe charges q1 and q2 on capacitors C1 and C2, respectively,as functions of time, after the switch is closed. Hint: Firstreconstruct the circuit so that it becomes a simple RC circuitcontaining a single resistor and single capacitor in series, connectedto the battery, and then determine the total charge qstored in the circuit.arrow_forwardE2 R1 R2 2. Find the charge on the capacitor after the switch has been left open for some time, then closed for some period of time. We can assume that C = 2 µF, with batteries of values E1 R2 = 0.25 N. 2V and E2 =1V, and resistor values R1 = 0.5 N and Sarrow_forwardYou connect a battery, resistor, and a capacitor as in figure 1, where R= 15.0 ohms and C= 5.00x10^-6 F. The switch S is closed at t=0. When the current in the circuit has magnitude 3.00 A, the charge on the capacitor is 40.0x10^-6 C. (A) what is the emf of the battery? (B) at what time t after the switch is closed is the charge on the capacitor equal to 40.0x10^-6? (C) when the current has magnitude 3.00 A, at what rate is the energy being stored in the capacitor? (D) when the current has magnitude 3.00 A, at what rate is energy being supplied by the battery?arrow_forward
- Physics for Scientists and Engineers, Technology ...PhysicsISBN:9781305116399Author:Raymond A. Serway, John W. JewettPublisher:Cengage Learning