Exam+1+--+Winter+2005+--+Blank

# Exam+1+--+Winter+2005+--+Blank - Form L Physics240 p 1...

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1. Three charges are arranged on a line as shown in the figure below. Which one of the following statements is fghp.? a) If Q is negative, and is positive, then Q, must feel a net force to the right. b) If is positive, q is negative, and might feel a net force to the right. c) If 8r, Qr,^d Q, ue all positive, the net force on must be zero. d) If the net force on 8, is zero, Nd I, musthave opposite signs. e) O,i,.i, fnd t are the net forces on charges q, and respectively, then Fr+4.+4:0. (The correct answer is c.) 2. Three identical charges of magnitud e Q areplaced at the corners of an equilateral triangle of size L. What is the magnitude of the net electrical force on one of the charges? Qr Qz Qs G-&-{ rr u\ Q'^ ' 4neoli D# o {3Q'- 4neol-i il ^30" 2neoli e)0 AA /\ o 0
3. Two charged particles, the first one with charge q, and mass ,7h and the second one with charge q, and mass rnz, are acrelerated from rest by a potential difference of AV. The ratio of these two particles' speeds, vrfv* is equal to: a) Q{tz Qz\ b) ,,w \Qzmr W c) .i- \mt d)L 8z ") ,':L \QZ (The correct answer is b.) 4. Cross sections of equipotential surfaces are shown for a region around the origin on the right' Which of the

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## This note was uploaded on 10/07/2010 for the course ENGINEERIN 240 taught by Professor Gidley during the Spring '10 term at University of Michigan.

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Exam+1+--+Winter+2005+--+Blank - Form L Physics240 p 1...

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