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Problem Set 3

# Problem Set 3 - MASSACHUSETTS INSTITUTE OF TECHNOLOGY...

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MASSACHUSETTS INSTITUTE OF TECHNOLOGY Department of Physics 8.02 Spring 2008 Problem Set 3 Due: Wednesday, February 27 at 11 am. Hand in your problem set in your section slot in the boxes outside the door of 32- 082. Make sure you clearly write your name, section, table, group (e.g. L01 Table 3 Group A) Problem 1 (10 points): Concept Questions. Explain your reasoning. Concept Question 1: A pyramid has a square base of side a, and four faces which are equilateral triangles. A charge Q is placed on the center of the base of the pyramid. What is the net flux of electric field emerging from one of the triangular faces of the pyramid? 1. 0 2. 0 8 Q ε 3. 2 0 2 Qa ε 4. 0 2 Q ε 5. Undetermined: we must know whether Q is infinitesimally above or below the plane? Explain your reasoning: Concept Question 2: A charge distribution generates a radial electric field G E = a r 2 e r / b ˆ r where a and b are constants. The total charge giving rise to this electric field is 1. 0 4 a πε 2. 0 3. 0 4 b πε Explain your reasoning:

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