# Exam1Sol - Principles of Physics II PHYS 2212-160 Exam #1...

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Principles of Physics II PHYS 2212-160 Exam #1 Lectures 0 – 5 Fall 2010 Name__ Solutions ______________ You may use the values k = 8.99x10 9 N m 2 /C 2 , and e = 1.60x10 -19 C, and Gauss’s Law ۳ · d ۯ ሬറ = (1/ ε o ) ρ dV . 1. (5 points) 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. The force from +Q is away and c. zero. the force from –Q is toward, so +q d. horizontal to the left. the sum is to the right. e. horizontal to the right. +Q –Q 2. (5 points) Charges Q 1 = –q and Q 2 = +4q are placed as shown. Of the five positions indicated by the numbers, the one at which the electric field ۳ is zero is 1 2 3 4 Q 1 Q 2 5 a. 1 b. 2 The electric field is away from Q 2 and toward Q 1 . The electric fields c. 3 between the two charges cannot cancel since they are in the same d. 4 direction. Point 5 is closer to the larger charge and so cannot have the e. 5 fields cancel. The point must be at point 1. 3. (5 points) Which of the following best represents the electric field lines around an electric dipole? (Circle the number below the drawing. Number 4 is the electric field.

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4. (5 points) If non-electric forces are negligible, a negatively charged particle released from rest in an electric field a. moves perpendicular to the field with a constant velocity. b. moves with constant velocity in the direction of the field. The force on a c. accelerates in the direction of the field. negative charge is d. accelerates in the direction opposite to the field. in a direction opposite
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## This note was uploaded on 01/23/2012 for the course PYSICS 2212 taught by Professor Jimguinn during the Spring '11 term at Georgia Perimeter.

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Exam1Sol - Principles of Physics II PHYS 2212-160 Exam #1...

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