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Physics4BSampleExam1

# Physics4BSampleExam1 - Name Physics 4B/Exam 1 Winter 2003...

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1 Name : _____________________________ Physics 4B/Exam 1 Winter 2003 MAKE SURE TO SHOW ALL WORK IN COMPLETE DETAIL! NO CREDIT WILL BE GIVEN IF NO WORK IS SHOWN!!! 1. A point charge +2.0μC is at the origin and a second point charge -3.0μC is at x = 50 cm. (15 pt) a) Calculate the potential at x = -50 cm and x = 40 cm. b) Find the potential at a general point on the positive y-axis (take +y to be upward on your coordinate system). c) Using the result of (b) find the potential at y = 40 cm. d) Using the result of (b) find the electric field component along the y-axis. e) Determine E y at y = 40 cm. 2. Consider the following 3-point charge distribution on figure 1 below. (15 pts) a) Draw the electric field line diagram associated with this charge distribution. Consider Gauss’s Law enc o q E dA  and the Gaussian Surface shown on Figure 2. b) In terms of the Gaussian surface shown EXPLAIN the meaning of the following terms: A. E B. dA C. enc q D. enc o q c) Explain qualitatively/quantitatively the flux due to each point charge through the Gaussian Surface.

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Physics4BSampleExam1 - Name Physics 4B/Exam 1 Winter 2003...

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