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Unformatted text preview: Practice Quiz 7 1) Two point charges q 1 = 4.0 C and q 2 = -8.0 C are placed along the x-axis at x 1 = 0 m and x 2 = 0.20 m, respectively. What is the electric potential energy of this system of charges? A) +1.4 J B) -1.4 J C) -32 J D) 4.0 J Answer: B 2) The potential energy at x = 8 m is -2000 V and at x = 2 m is +400 V. What is the magnitude and direction of the electric field? A) 200 V/m directed parallel to the + x-axis B) 300 V/m directed parallel to the + x-axis C) 400 V/m directed parallel to the + x-axis D) 600 V/m directed parallel to the + x-axis Answer: C 3) Four equal point charges of magnitude 6.00 C are placed at the corners of a square 2.00 m on each side, as shown in Figure. What is the electric potential of these charges at the center of this square? A) 76.4 kV B) 38.2 kV C) 153 kV D) 61.0 kV Answer: C 4) Two identical charges of magnitude 6.0 C are placed at the corners of the base of an equilateral triangle, as shown in Figure. What is the electric potential at the vertex, P, of the triangle due to these charges? shown in Figure....
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