exam1-practice-dd

# exam1-practice-dd - Physics II Exam 1 155 points Name...

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Part I. Questions 1-10. 8 points each. Multiple choice : For full credit , circle only the correct answer. For half credit , circle the correct answer and one incorrect answer. For ¼ credit, circle the correct answer and two incorrrect answers. 1 . Two small spheres repel one another electrostatically. Which of the following must be true? a. Both have the same charge. b. Neither is charged. c. Both are charged. d. At least one sphere is charged. e. They are oppositely charged. 2 . Three charges +q, +Q, and -Q are placed at the corners of an equilateral triangle as shown. The net force on charge +q due to the other two charges is a. vertically up b. vertically down. c. zero. d. horizontal to the left. e. horizontal to the right. 3 . A positive charge is brought close to a fixed neutral conductor that has a cavity. The cavity is neutral; that is, there is no net charge in the cavity. Which of the figures best represents the charge distribution on the inner and outer walls of the conductor? a. 1 b. 2 c. 3 d. 4 e. 5 4 . A long box of length l , width w , and height h contains a line of positive charge density + λ . The line of charge is oriented parallel to the length of the box, is centered within the box, and is length l /2. The net electric flux through the box is a. zero b. positive c. negative d. not enough information given e. positive through one end, and negative through the other Page 1 of 6 Physics II Exam 1 155 points Name _______________ Discussion day/time_______________ +q -Q +Q + + + + - - - 3 + + + + - - - + + + - - + + - 4 + + + + - - - 1 + + + + - - - 2 + + + + + + + + + - - - - - - - - - 5

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5 . Four charges of equal magnitude are arranged at the corners of a square. In which arrangement is the magnitude of the electric field at point P a maximum?
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• Fall '10
• Feiguin
• Charge, Electric charge

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