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physics final

# physics final - Physics 102 Final Exam May 1 1995 There are...

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Physics 102 May 1 , 1995 Final Exam There are 8 problems in the exam, each is worth 25 points. All work must be preformed in the blue book provided. Start each problem on a fresh page, work to get credit for a problem. A Formula sheet is provided. You for numerical computations only. Answers must have appropriate of the exam is 3 hours. You must show all may use a calculator units, The duration 1. Two point charges are located at the points of coordinates: x l = 0, y 1 = 0.5 m, z 1 = 0 and x 2 = 0, y 2 = 0, z 2 = l.0 m 2. 3. 4. The charges are: Q 1 = 6μC and Q 2 = -6μC, respectively. Find the potential at a point of coordinates, x = 3.0m, y = 2.0m, z = l.0m The plates of a large capacitor are parallel to each other and each have an area A = 4.0cm 2 . The charges on the plates are equal in magnitude, = lC, and opposite in sign. a) Neglecting edge effects, determine the electric field between the plates. (Hint: use Gauss’ law.) b) If the plates are separated by 0.1 cm find the voltage across the capacitor and the capacitance of this capacitor.

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