# Exam1A - 1 Two uncharged conducting spheres A and B are...

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1. Two uncharged, conducting spheres, A and B , are held at rest on insulating stands and are in contact. A positively charged rod is brought near sphere A as suggested in the figure. While the rod is in place, someone moves sphere B away from A . How will the spheres be charged, if at all ? Sphere A Sphere B A) positive positive B) positive negative C) negative positive D) negative negative E) zero zero 2. Which one of the following statements concerning electrostatic situations is false? A) E is zero everywhere inside a conductor. B) Equipotential surfaces are always perpendicular to E . C) Zero work is needed to move a charge along an equipotential surface. D) If V is constant throughout a region of space, then E must be zero in that region. E) If E is constant in a region of space, V must be constant in that region. Page 1

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3. Three charges are positioned as indicated in the figure. What are the horizontal and vertical components of the net force exerted on the +13 µ C charge by the other two charges? horizontal vertical A) 95 N -129 N B) 76 N 310 N C) -129 N -312 N D) -95 N -95 N E) 129 N 312 N 4. A 4-A current is maintained in a simple circuit with a total resistance of 2 Ω . How much energy is delivered in 3 seconds? A) 3 J B) 6 J C) 12 J D) 24 J E) 96 J Page 2
A voltage difference of 1000 V is maintained and the separation is 10 cm (0.1 m). The point P is located 1.0 * 10 –5 m away from the positive plate. If a +2.0 * 10 –5 C point charge is placed at P , what is the force exerted on it? A) 0.2 N, toward the negative plate B) 0.2 N, toward the positive plate C) 5 x 10 4 N, toward the positive plate D) 5 x 10 4 N, toward the negative plate E) 5 x 10 4 N, into the plane of the page 6. Four point charges are held fixed at the corners of a square as shown in the figure. Which of the five arrows shown below most accurately shows the direction of the net force on the charge –Q due to the presence of the three other charges? Page 3

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## This note was uploaded on 09/26/2008 for the course PHYSICS 126 taught by Professor Amidei during the Fall '08 term at University of Michigan.

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Exam1A - 1 Two uncharged conducting spheres A and B are...

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