4B_SP10_con08_28 - Physics 4B Spring 2010 Conference # 8 DC...

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Physics 4B Spring 2010 Answers: 1. (a) 0.706 , (b) 11.2 V, 2. (a) 7.81 , (b) 0.569 V, 3. (a) 1.52 ms, (b) 1/3 E , 2/3 , (c) 5/9 Conference # 8 – DC Circuits 1. (Ch. 28 Exercise 1) A battery has an emf E and an internal resistance r . It is connected to an external resistor R . When R = 4 the terminal potential difference is 9.5 V, and when R = 6 the terminal potential difference is 10 V. Find E and r . 2. (Ch. 28 Exercise 9) (a) Find the equivalent resistance of the combination of resistors shown in Fig. 28.36. (b) If a 10-V potential difference is applied across points a and b find the potential difference across the 4- resistor. 3. The resistance and capacitance for an RC series circuit are
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