(II) If 21.0 V is applied across the whole network of Fig. 19–63, calculate (a) the voltage across each capacitor and (b) the charge on each capacitor. C = 3.00 μF C2 = 4.00 μF C3 = 2.00 μF FIGURE 19-63 V= Problems 39 and 40. -21.0 V-

In the circuit shown in Fig. 19–93, C¡ = 1.0 µF, C2 = 2.0 µF, C3 = 2.4 µF, and a voltage_ Vab = 24 V is applied across points a and b. After C, is fully charged, the switch is thrown to the right. What is the final charge and potential differ- ence on each capacitor? ao C2 FIGURE 19-93 C3 Problem 97. bo

capacitor and take C = xe A/d and Q = CAV to investigate the charge as follows. Use typical values for a cylindrical axon of cell wall thickness d = 1.6 x 10-8 m, axon radius r = 2.0 x 10¹ μm, and cell-wall dielectric constant x = 2.2. Positive charge layer Negative { charge layer External fluid Axon wall membrane 1 O No O Internal fluid Axon radius = r + d Q (a) Calculate the positive charge on the outside of a 0.10-m piece of axon when it is not conducting an electric pulse. (Assume an initial potential difference of 7.0 x 10-2 v.) C How many K+ ions are on the outside of the axon assuming an initial potential difference of 7.0 x 10-2 V? K+ ions Is this a large charge per unit area? Hint: Calculate the charge per unit area in terms of electronic charge e per angstrom squared (A2). An atom has a cross section of about 1 A² (1 A = 10-10 m). (Compare to normal atomic spacing of one atom every few A.) Yes

If Vab=10 Volts according to the circuit in the figure, find the charge accumulated on the 6 uF capacitor? a 3µF 28µF 14µF lµF 6µF 3 - 3µF, 7µF 3µF 18µF O a) 5 ОВ) 10 O NS) 160/21 OD) 4.84.10^(-6) O TO) 4

A particular 12 V car battery can send a total charge of 84Ah (ampere-hours) through a circuit, from one terminal to the other. (a) How many coulombs of charge does this represent? (Hint: See Eq. 21-3.) (b) If this entire charge undergoes a change in electric potential of 12 V, how much energy is involved?

(III) Two resistors and two uncharged capacitors are arranged as shown in Fig. 19–72. Then a potential difference of 24 V is applied across the combination as shown. (a) What is the potential at point a with switch S open? (Let V = 0 at the negative terminal of the source.) (b) What is the potential at point b with the switch open? (c) When the switch is closed, what is the final potential of point b? (d) How much + charge flows through 24 V 8.8 N 0.48 μF a S the switch S after it is closed? 4.4 2 0.36 μF FIGURE 19–72 Problem 58.

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(a) A 60-W incandescent bulb operates at 120 V. How many electrons and coulombs flow through the bulb in one hour? +

(2)What happens to the capucitan ce of each of the two identical capacitors, each with an initial Capacitance Co, connected in Series when the Charge on each capacitor is doubled