Question

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1. (8 points total) A parallel plate capacitor whose plates have area A and plate separation d is connected to a battery. While the capacitor remiains connected to the battery, describe quantitatively what will happen to the charge on the capacitor if each if the following actions occur. That is, explain numerically how the magnitude of the charge on the capacitor in each circumstance compares to the original a. (3 pts) The distance between the plates is tripled b. (2 pts) The area of the plates is halved C. (3 pts) The voltage produced by the battery is doubled. 2. (15 points) A battery with emf 6.0 V and internal resistance r is pictured ·-www- in the thick-lined box in the circuit on the right. Point A is the positive- terminal of the battery and point B is the negative terminal. The battery is connected to an external resistor and a switch as shown. The value of the internal resistance r is 0.50 2. The value of the external resistor is 12.0 2. What is the potential difference across the battery's terminals when the switch S is open, as shown? a. p. What is the potential difference across the battery's terminals when the switch S is closed?_ Page 1 of 5

Answer 1

apacitance 약 the capacitor iš diven b 1. -AG plate area is given , where d= Separat!'on between lates. Charge on capacitor, q. CV So, change on capacitor" α. A a) lwhen distane between the plates is tripled, Charge. ecomeS mes 1-е. 3 3d 3 plates is halved, b) when area half i e. charçe becomes ) E' Charge, dh: ( : c) when voltage 엎 batter is doubled, ch ї. e. arge becomes Twice. Chage,a3= A6,(N), 2d.

2 Ra 12.0-n RE 122 a. when switch Śİs open,' current flows in lơop Potential difference acress batte terminalsE GV when switch S is closed, . Ľ--E ·ー-0.48A 120.S Current,土 Potential difference across battery terminals E-Ir