PHYS_102-Spring08-Q3-Soln

# PHYS_102-Spring08-Q3-Soln - OUTLINE OF SOLUTIONS PHYS-102...

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OUTLINE OF SOLUTIONS PHYS-102 SPRING-08 QUIZ-III Time Limit: 50 min. NOTE: For Prob.1, below, please circle the answer of your choice for each part. 1a . Two wires each of length, L are made of the same material of electrical resistivity ρ and have uniform but different cross-sectional areas. The ratio of their cross-sectional areas is 2:1. What is the corresponding ratio of their electrical resistance? (a). 2:1 ( b) 1:1 (c) 1:2 (d). 1:4 (Resistance is inversely proportional to the cross-sectional area) 1b . How much energy (in units of J) is dissipated as heat during a two-minute time interval by a 1.5 k Ω resistor that has a constant 20.0 V potential difference across its leads? (a.) 30 (b) 46 c) 32 (d) 72 (Energy = P* Δ t = I 2 R Δ t = V 2 Δ t/R = 400*2*60/1500 = 32J) 1c .The diagram to the right shows part of an electrical circuit. The current through the 4.0 Ω resistor is (in units of A ) : (a) 0.1 (b) 0.15 (c) 0.2 (d) 0.6 (i 4 +i 2 = 0.3A and 4i 4 = 2i 2 , solve these equations to get i 4 = 0.1A) 1d . Consider an initially uncharged capacitor, C in a series RC circuit. The switch S is

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PHYS_102-Spring08-Q3-Soln - OUTLINE OF SOLUTIONS PHYS-102...

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