TB_chapter16

# TB_chapter16 - Chapter 25 Capacitance Goals Understand the...

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Chapter 16, Electrical Energy and Capacitance C HAPTER 16 Conceptual Questions C1. Two equal positive charges are separated by d . Then one of the charges is replaced by a negative charge of the same magnitude. Take the potential at infinity to be zero. In which situation is the potential higher midway between the charges; is this value of potential zero? a. the first situation; yes b. the first situation; no c. the second situation; yes d. the second situation; no C2. Case 1: An electron is released from rest in a uniform electric field. Case 2: A proton is released from rest in a uniform electric field of the same magnitude as in case 1. How does the electric potential energy of the charge-field system behave in these cases? a. In both cases, the potential energy increases. b. In both cases, the potential energy decreases. c. In case 1 the potential energy increases, but in case 2 it decreases. d. In case 1 the potential energy decreases, but in case 2 it increases. C3. An electron and a proton are each released from rest in the same uniform electric field. The electron moves a distance d electron and the proton moves a distance d proton as each particle’s kinetic energy increases by 1.6 eV. How do d electron and d proton compare? C4. Three capacitors have capacitances C 1 < C 2 < C 3 . If these capacitors are connected in series, which of the following is true for the resulting equivalent capacitance? C5. A capacitor is attached across a battery and charged. Then the battery is removed leaving the capacitor charged. The positive lead of the capacitor is then connected to one lead of a previously uncharged identical capacitor, and then the other lead of the charged capacitor is connected to the other lead of the second capacitor. How does the energy E o stored in the originally charged capacitor compare to the energy E f stored in the connected capacitors? a. E o < E f b. E o = E f c. E o = 2 E f d. E o = 4 E f 16.1 Potential Difference and Electric Potential 18

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Chapter 16, Electrical Energy and Capacitance 1. An electron (charge - 1.6 × 10 - 19 C) moves on a path perpendicular to the direction of a uniform electric field of strength 3.0 N/C. How much work is done on the electron as it moves 15 cm? a. 4.8 × 10 - 20 J b. - 4.8 × 10 - 20 J c. 1.6 × 10 - 20 J d. zero 2. A proton (+1.6 × 10 - 19 C) moves 10 cm on a path in the direction of a uniform electric field of strength 3.0 N/C. How much work is done on the proton by the electrical field? a. 4.8 × 10 - 20 J b. - 4.8 × 10 - 20 J c. 1.6 × 10 - 20 J d. zero
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