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phy2049_s12_exam2_practice

1 250 2 120 3 20 4 90 5 70

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Unformatted text preview: at Q is defined to be 4.5 V, what is the potential at P? (1) 10.5 V (2) 15 V (3) 6.0 V (4) 24.0 V (5) - 10 V PHY 2049 Spring 2012 Exam 2 Problem 4 In the shown figure, R1 = R2 = R3 = 50 Ω, R4 = 100 Ω, and the ideal battery has EMF = 6 V. What is the equivalent resistance of the circuit? (1) 250 Ω (2) 120 Ω (3) 20 Ω (4) 90 Ω (5) 70 Ω Problem 5 A capacitor with an initial potential difference of 50 V is discharged through a 106 Ω resistor when a switch between them is closed at t=0. At t=2 s, the potential difference across the capacitor is 25 V. What is the capacitance of the capacitor? (1) 2.0x10- 6 F (2) 2.9x10- 6 F (3) 3.5x105 F (4) 3.5x10- 7 F (5)...
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