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# p2f07_exam1_grading_key - PHYS-1200 PHYSICS II EXAM 1A...

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PHYS-1200 PHYSICS II EXAM 1A Sept 26, 2007 NAME ____GRADING KEY________

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NAME ______________________________ PART A . (40%) Each question is worth 4%. In the space provided, to the left of the question number, write the letter corresponding to the best answer to the question. __b__A1) A 3 μ C point charge q 1 is located a distance d away from a -6 μ C point charge q 2 . What is the ratio of forces 12 21 / F F r r ? a) ½ b) 1 c) 2 d) 18 e)1/18 __a__A2) Two identical small spheres are separated by a distance of d. The spheres originally have equal but opposite charges and the force between them is F 0 . Half of the charge on one sphere is transferred to the other. The new force between the spheres is a) F 0 /4 b) F 0 /2 c) 3F 0 /4 d) 3F 0 /2 e) It cannot be determined. __c_A3) The figure below shows a portion of an electric circuit. What is the direction and magnitude of the current flowing in the wire labeled B? Arrows show the direction of current for the current magnitudes shown for other wires in the circuit. a) 4A, up b) 4A, down c) 6A, up d) 8A, up e) There is not enough information to solve for B. _b__A4) A parallel plate capacitor has two square plates of side length d, separated by distance b. The capacitance is C 0 . What would the capacitance of a similar capacitor be if the side length were increased to 2d and the distance were increased to 2b? a) 8C 0 b) 2C 0 c) C 0 /2 d) C 0 /8 e) There is not enough information to solve for the new capacitance. page 2 of 9 10A 2A 1A 3A B
NAME ______________________________ __e_A5) A point charge q is situated a distance d/2 above a square surface of side d as shown. The electric flux through the square is: a) It cannot be determined. b) 0 2 / q d ε c) 0 / 4 q πε d) 2 0 / q d πε e) 0 / 6 q ε __a__A6) Three identical 1 F capacitors are wired as shown across a 10 V battery.

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