COLLEGE PHYSICS
2nd Edition
ISBN: 9781464196393
Author: Freedman
Publisher: MAC HIGHER
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Chapter 21, Problem 2QAP
To determine
Does ohms law equation (V=IR) apply to alternating currents?
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When applying Kirchhoff's loop rule (such as in Fig. 19–36),
does the sign (or direction) of a battery's emf depend on
the direction of current through the battery? What about
the terminal voltage?
r= 1.0 2
E = 18 V
R=6.6 N
r= 2.0 Q
FIGURE 19-36
Question 10.
E = 12 V
35 (a) For the circuit shown in Fig. 20-27, let & =
10 V, R = 5.0 N, and C = 0.1 F. What is the current
at b just after the switch is closed?
(b) How much charge will have passed b by the time
%3D
%3D
%3D
the current goes to zero?
(c) Find the current at the instant the capacitor has a
charge of 0.20 C.
9.
Soitch S
If you work out enough to visibly increase the diameter of your biceps, will this increase or decrease your susceptibility to electric shock? Explain.
Chapter 21 Solutions
COLLEGE PHYSICS
Ch. 21 - Prob. 1QAPCh. 21 - Prob. 2QAPCh. 21 - Prob. 3QAPCh. 21 - Prob. 4QAPCh. 21 - Prob. 5QAPCh. 21 - Prob. 6QAPCh. 21 - Prob. 7QAPCh. 21 - Prob. 8QAPCh. 21 - Prob. 9QAPCh. 21 - Prob. 10QAP
Ch. 21 - Prob. 11QAPCh. 21 - Prob. 12QAPCh. 21 - Prob. 13QAPCh. 21 - Prob. 14QAPCh. 21 - Prob. 15QAPCh. 21 - Prob. 16QAPCh. 21 - Prob. 17QAPCh. 21 - Prob. 18QAPCh. 21 - Prob. 19QAPCh. 21 - Prob. 20QAPCh. 21 - Prob. 21QAPCh. 21 - Prob. 22QAPCh. 21 - Prob. 23QAPCh. 21 - Prob. 24QAPCh. 21 - Prob. 25QAPCh. 21 - Prob. 26QAPCh. 21 - Prob. 27QAPCh. 21 - Prob. 28QAPCh. 21 - Prob. 29QAPCh. 21 - Prob. 30QAPCh. 21 - Prob. 31QAPCh. 21 - Prob. 32QAPCh. 21 - Prob. 33QAPCh. 21 - Prob. 34QAPCh. 21 - Prob. 35QAPCh. 21 - Prob. 36QAPCh. 21 - Prob. 37QAPCh. 21 - Prob. 38QAPCh. 21 - Prob. 39QAPCh. 21 - Prob. 40QAPCh. 21 - Prob. 41QAPCh. 21 - Prob. 42QAPCh. 21 - Prob. 43QAPCh. 21 - Prob. 44QAPCh. 21 - Prob. 45QAPCh. 21 - Prob. 46QAPCh. 21 - Prob. 47QAPCh. 21 - Prob. 48QAPCh. 21 - Prob. 49QAPCh. 21 - Prob. 50QAPCh. 21 - Prob. 51QAPCh. 21 - Prob. 52QAPCh. 21 - Prob. 53QAPCh. 21 - Prob. 54QAPCh. 21 - Prob. 55QAPCh. 21 - Prob. 56QAPCh. 21 - Prob. 57QAPCh. 21 - Prob. 58QAPCh. 21 - Prob. 59QAPCh. 21 - Prob. 60QAPCh. 21 - Prob. 61QAPCh. 21 - Prob. 62QAPCh. 21 - Prob. 63QAPCh. 21 - Prob. 64QAPCh. 21 - Prob. 65QAPCh. 21 - Prob. 66QAPCh. 21 - Prob. 67QAPCh. 21 - Prob. 68QAPCh. 21 - Prob. 69QAPCh. 21 - Prob. 70QAPCh. 21 - Prob. 71QAPCh. 21 - Prob. 72QAPCh. 21 - Prob. 73QAPCh. 21 - Prob. 74QAPCh. 21 - Prob. 75QAPCh. 21 - Prob. 76QAPCh. 21 - Prob. 77QAPCh. 21 - Prob. 78QAPCh. 21 - Prob. 79QAPCh. 21 - Prob. 80QAPCh. 21 - Prob. 81QAPCh. 21 - Prob. 82QAPCh. 21 - Prob. 83QAPCh. 21 - Prob. 84QAPCh. 21 - Prob. 85QAP
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- ww In the circuit shown in the figure, the S switch is closed at t = 0 and the capacitors, which are completely empty, begin to fill. Here & = 15 V, C = 9 uF and R 65 0. A) What is the time constant of the circuit, T, in units of microseconds? Answer: B) When t = T, what is the total charge, in units of microcoulomb, accumulated in the capacitors? Answer:arrow_forward71 In Fig. 27-69, R¡ = 20.0 N, R, 10.0 2, and the ideal battery has emf E = 120 V. What is the current at point a if we close (a) only switch S1, (b) only switches S, and S2, and (c) all three switches? S2 S3 a +18 RE RE R R1- + R1 R2 R2 Figure 27-69 Problem 71.arrow_forward7. When the switch shown in Fig. 19–45 is closed, what will happen to the voltage across resistor R,? It will (a) increase. (b) decrease. (c) stay the same. R1 S V R3 R4 FIGURE 19-45 R2 MisConceptual Questions 7 and 8.arrow_forward
- 1) An initially uncharged capacitor C is in a single loop with an ideal battery E and a resistor R. The switch is closed and current versus time data is collected using Logger Pro. A 3.5 3 E- 2.5 2 1.5 0.5 Time (ms) 20 40 60 80 100 120 140 160 180 200 220 240 (a) State the quantity represented by the "area under the curve" (integral) of the current vs. time graph. (b) Describe why the current decreases over time, and eventually 0 current travels through the circuit. Current (mA) 1,arrow_forward95 In Fig. 27-79, E, = 6.00 V, = 12.0 V, R = 100 0, R, = 200 N, and R, = 300 N. One point of the circuit is grounded (V = the (a) size and (b) direction (up or down) of the current through resistance 1, the (c) size and (d) direction (left or right) of the current through resistance 2, and the (e) size and (f) direction of the current through resistance 3? (g) What is the electric potential at point A? 0), What arearrow_forwardOccupational safety experts have developed an alternative criterion for electrical safety. They have found that shocks lasting less than 3 s will be nonlethal if the product of the voltage drop across the body, the current through the body, and the time ( ≤ 3.0 s) that the current flows does not exceed 13.5 V • A • s = 13.5 J . Suppose that one hand of a potential victim is grounded and the other hand touches a voltage source; suppose further that his skin resistance is negligible—a worstcase scenario. Using the criterion above, what is the lowest voltage that will not be lethal for a shock that lasts 1.0 s?arrow_forward
- A current of 6 sin 4t A flows through a 2-F capacitor. Find the voltage v(t) across the capacitor given that v(0) = 1 V. Complete solution, explanation and illustration.arrow_forward9. (II) A bird stands on a de electric transmission line carrying 2800 A (Fig. 18–34). The line has 2.5 × 10~$ N resistance per meter, and the bird's feet are 4.0 cm apart. What is the potential difference between the bird's feet? FIGURE 18-34 Problem 9.arrow_forwardFor the circuit shown in the figure, V = 60 V, C = 20 uF, and R = 0.10 MQ. Initially the switch S is open and the capacitor is uncharged. The switch is then closed at time t = 0.00 s. What is the charge on the capacitor 8.0 s after closing the switch? C Hint: Straightforward use of the charge vs. time expression. Standard units during the calculation! O 1600 uC O 1200 uc O 1400 uC O 1900 uC O 940 uCarrow_forward
- For the circuit shown below, ε=22 V, L=7.5 mH, and R=6Ω. After steady state is reached with S1 closed and S2 open, at t=0, S2 is closed and S1 is opened. Determine (a) the current through L at t=0, (b) the current through L at t=4.5×10-4 s, (c) the voltage across R on the right at t=4.5×10-4 s, and (d) the rate at which current through L changes at t=4.5×10−4 s. The current through L at t=0 is__________A. The current through L at t=4.5×10-4 s is_____A. The voltage across R at t=4.5×10-4 s is______V. The rate at which current through L changes at t=4.5×10-4 s is______A/s.arrow_forwardA galvanic cell produces direct current, which flows in one direction. The mains supply at your home is a source of alternating current, which changes direction every fraction of a second. Explain why the external electrical supply for an electrolytic cell must be a source of direct current, rather than alternating current.arrow_forwardPL (mW) For the circuit shown, the power dissipated in the load 60 Re Resistance RL, is given as a function of RL. 40 + Q 7.8 The value of resistance Rs (in 2) is: 32 N E 20 20 40 60 80 100 RL (N) 20 24 32 16 8 00arrow_forward
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