COLLEGE PHYSICS
2nd Edition
ISBN: 9781464196393
Author: Freedman
Publisher: MAC HIGHER
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Chapter 18, Problem 61QAP
To determine
The value of resistor RA and RB.
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87 The circuit of Fig. 27-75 shows a
capacitor, two ideal batteries, two
resistors, and a switch S. Initially S has
been open for a long time. If it is then
closed for a long time, what is the
change in the charge on the capacitor?
Assume C = 10 µF, E, = 1.0 V, 82 = 3.0 Figure 27-75 Problem 87.
V, R = 0.20 0, and R2 = 0.40 N.
R2
94 Figure 27-79 shows three 20.0 2
resistors. Find the equivalent resist-
ance between points (a) A and B, (b)
A and C, and (c) B and C. (Hint: A
Imagine that a battery is connected
between a given pair of points.)
Figure 27-79 Problem 94.
50544
Chapter 19 Ho
ates > Chapter 19 Homework
O Resources
A doubly ionized molecule (i.e., a molecule lacking two electrons) moving in a magnetic field experiences a magnetic force
of 5.89 x 10-16 N as it moves at 229 m/s at 77.1° to the direction of the field. Find the magnitude of the magnetic field.
of
Chapter 18 Solutions
COLLEGE PHYSICS
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- A battery is used to charge a capacitor through a resistor as shown in Figure P27.44. Show that half the energy supplied by the battery appears as internal energy in the resistor and half is stored in the capacitor. Figure P27.44arrow_forwardConsider the circuit shown in Figure P26.24, where C1, = 6.00 F, C2 = 3.00 F. and V = 20.0 V. Capacitor C1 is first charged by closing switch S1. Switch S1 is then opened, and the charged capacitor is connected to the uncharged capacitor by closing Calculate (a) the initial charge acquired by C, and (b) the final charge on each capacitor.arrow_forwardIf three unequal capacitors, initially uncharged, are connected in series across a battery, which of the following statements is true? (a) The equivalent capacitance is greater than any of the individual capacitances, (b) The largest voltage appeal's across the smallest capacitance, (c) The largest voltage appears across the largest capacitance. (d) The capacitor with the largest capacitance has the greatest charge, (e) The capacitor with the smallest capacitance has the smallest charge.arrow_forward
- Assume a length of axon membrane of about 0.10 m is excited by an action potential (length excited = nerve speed pulse duration = 50.0 m/s 2.0 103 s = 0.10 m). In the resting state, the outer surface of the axon wall is charged positively with K+ ions and the inner wall has an equal and opposite charge of negative organic ions, as shown in Figure P18.43. Model the axon as a parallel-plate capacitor and take C = 0A/d and Q = C V to investigate the charge as follows. Use typical values for a cylindrical axon of cell wall thickness d = 1.0 108 m, axon radius r = 1.0 101 m, and cell-wall dielectric constant = 3.0. (a) Calculate the positive charge on the outside of a 0.10-m piece of axon when it is not conducting an electric pulse. How many K+ ions are on the outside of the axon assuming an initial potential difference of 7.0 102 V? Is this a large charge per unit area? Hint: Calculate the charge per unit area in terms of electronic charge e per squared (2). An atom has a cross section of about 1 2 (1 = 1010 m). (b) How much positive charge must flow through the cell membrane to reach the excited state of + 3.0 102 V from the resting state of 7.0 102 V? How many sodium ions (Na+) is this? (c) If it takes 2.0 ms for the Na+ ions to enter the axon, what is the average current in the axon wall in this process? (d) How much energy does it take to raise the potential of the inner axon wall to + 3.0 102 V, starting from the resting potential of 7.0 102 V? Figure P18.43 Problem 43 and 44.arrow_forwardDraw two graphs of charge versus time on a capacitor. Draw one for charging an initially uncharged capacitor in series with a resistor, as in the circuit in Figure 21.38, starting from t = 0. Draw the other for discharging a capacitor through a resistor, as in the circuit in Figure 21.39, starting at t = 0, with an initial charge Q0. Show at least two intervals of t.arrow_forwardThe circuit in Figure P18.55 has been connected for several seconds. Find the current (a) in the 4.00-V battery,(b) in the 3.00- resistor,(c)in the 8.00-V battery, and (d)in the 3.00-V battery.(e)Find the charge on the capacitor.arrow_forward
- Consider the circuit shown in Figure P20.52, where C1 = 6.00 F, C2 = 3.00 F, and V = 20.0 V. Capacitor C1 is first charged by closing switch S1. Switch S1 is then opened, and the charged capacitor is connected to the uncharged capacitor by closing S2. Calculate (a) the initial charge acquired by C1 and (b) the final charge on each capacitor. Figure P20.52arrow_forwardTwo capacitors, C1 = 25.0 F and C2 = 5.00 F, are connected in parallel and charged with a 100-V power supply. (a) Draw a circuit diagram and (b) calculate the total energy stored in the two capacitors. (c) What If? What potential difference would be required across the same two capacitors connected in series for the combination to store the same amount of energy as in part (b)? (d) Draw a circuit diagram of the circuit described in part (c).arrow_forwardA 58 F capacitor and a 471 resistor are connected to a battery of voltage 7 V as shown in the circuit. After closing the switch, when the capacitor voltage is half of battery voltage how much energy is stored in the capacitor? Express your answer in Joules (J) E 41- 7 C Rarrow_forward
- Potential difference across the terminals of the left battery? Voltage contribution due to the internal resistance in the left battery? A 0;0 B E1;-Ir1 C E1;Ir1 D -E1;Ir1arrow_forwardPage of 8 4 Reference figure for N. 13-15. Three resistors are connected as shown in the figure. The potential difference between points A and B is 26 V. 2.0 2 3.0 2 4.0 2 N. 13. What is the equivalent resistance between the points A and B? A) 3.8 Q B) 4.3 Q C) 5.1 Q D) 6.8 Q E) 9.0 0 Ans: B N. 14. How much current flows through the 3-0 resistor? A) 2.0 A B) 4.0 A C) 6.0 A D) 8.7 A E) 10.0 A Ans: C N. 15. How much current flows through the 2-Q resistor? A) 2.0 A B) 4.0 A C) 6.0 A D) 8.7 A E) 10.0 A Ans: B DELL F10 F11 F12 PrtScr Insert Delete F4 F5 F6 F7 F8 F9arrow_forwardWhat is the overall energy stored in microjoules (µJ) within the capacitors in the circuit depicted in the image?arrow_forward
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