Problem Set 5 Solutions

Problem Set 5 Solutions - MASSACHUSETTS INSTITUTE OF...

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Unformatted text preview: MASSACHUSETTS INSTITUTE OF TECHNOLOGY Department of Physics 8.02 Fall 2007 Problem Set 5 Solutions Problem 1: Seven Short Questions. Circle your choice for the correct answer. Question A (4 points out of 20 points): Three charges lie on the x-axis a distance a apart. The charges are numbered from 1 to 3 moving from left to right. A representation of the electric potential V of these three charges is shown above. Which one of the following statements is true? The electric field is zero d 1. at some point between charges 1 and 2 an also at some point between charges 2 and 3 2. at some point between charges 1 and 2 but never between charges 2 and 3 3. never between charges 1 and 2 but at some es 1 and 2 or between charges 2 and 3 point between charges 2 and 3 4. nowhere between charg 5. I dont know (this answer is worth 1 point) Question B (4 points out of 20 points): Consider the capacitor at right, with d << A , filled with three different dielectrics, as pictured. What is the capacitance of this capacitor? 2 3 2 3 1 1 2 3 2 3 2 3 1 3 1 2 2 3 1 3 1 2 3 1 2 3 1 2 3 1 2 3 1) 3) 4) 3 3 5) 6) d A A C C d d A d C C d A 2) 2 2 A C C A d = + = + = + + + = = + + + + = + + + 7) I dont know (this answer is worth 1 point) PS05 Solution - 1 Question C (4 points out of 20 points): In the figure below, a point charge 1 Q + is at the center of an imaginary spherical Gaussian surface and another point charge 2 Q + is outside of the Gaussian surface. Point P is on the surface of the sphere. Which one of the following statements is true? 1. Both charges 1 Q + and 2 Q + contribute to the net electric flux through the sphere but only charge 1 Q + contributes to the electric field at point P on the sphere. 2. Both charges 1 Q + and 2 Q + contribute to the net electric flux through the sphere but only charge 2 Q + contributes to the electric field at point P on the sphere. 3. Only the charge 1 Q + contributes to the net electric flux through the sphere but both charges 1 Q + and 2 Q + contribute to the electric field at point P . 4. Only the charge 2 Q + contributes to the net electric flux through the sphere but both charges 1 Q + and 2 Q + contribute to the electric field at point P ....
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This homework help was uploaded on 04/07/2008 for the course 8 8.02 taught by Professor Hudson during the Fall '07 term at MIT.

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Problem Set 5 Solutions - MASSACHUSETTS INSTITUTE OF...

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