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PHY213_SampleExam1

# PHY213_SampleExam1 - PHYSICS 213 PRACTICE EXAM 1*The actual...

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PHYSICS 213 – PRACTICE EXAM 1* *The actual exam will contain EIGHT multiple choice quiz-type questions covering concepts from lecture (16 points), ONE essay-type question covering an important fundamental principle from lecture (4 points), and FOUR problems similar to the problems that follow (80 points). NAME (printed) SIGNATURE Student Number SECTION Wait for oral instructions before starting the test. INSTRUCTIONS Remember to show (in English) your problem solving steps for FULL CREDIT. A calculator and a one-sided 8½X11 student reference sheet are permitted. Your reference sheet may contain equations, graphs, and notes; however, quiz questions and worked out problems CANNOT be included. Cell phones/communication devices must be put away. For the graders: Q1-9 P1 P2 P3 P4 TOTAL

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Electrostatics [20 Points] Two point charges –Q and +Q are fixed at the upper corners of the rectangle and one point charge q is fixed at the midpoint between the two lower corners of the rectangle. The rectangle has dimensions a = 8.00 cm and b = 6.00 cm. The three point charges have values of - Q = -3.00 nC, + Q = 3.00 nC, and q = 9.00 nC. a) Find the magnitude and direction of the electric field at point P. [8 points] Answer: E = 6.13 x 10 4 N/C, θ = 168° ccw from the + x-axis b) An electron is placed at point P and released. Find the magnitude and direction of the acceleration experienced by the electron. [3 points] Answer: a = 1.08 x 10 16 m/s, θ = 348° ccw from the + x-axis c) Find the value of the electric potential at point P. [5 points] Answer: V = 1.01 x 10 3 V d) Find the change in potential energy of an electron which moves from point P to the center point of the rectangle. [4 points] Answer: ΔPE = -1.62 x 10 -16 J
Electrostatic Equilibrium [20 Points] Two 500 g spheres with charges of -2.00 µ C each are suspended by 10.0 cm

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