ps05sol

# ps05sol - MASSACHUSETTS INSTITUTE OF TECHNOLOGY Department...

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MASSACHUSETTS INSTITUTE OF TECHNOLOGY Department of Physics 8.02 Fall 2008 Problem Set 5 Solutions Problem 1: Five 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… 1. …at some point between charges 1 and 2 and also at some point between charges 2 and 3 2. …never between charges 1 and 2 but at some point between charges 2 and 3 3. …at some point between charges 1 and 2 but never between charges 2 and 3 4. …nowhere between charges 1 and 2 or between charges 2 and 3 5. I don’t know (this answer is worth 1 point) Question B (4 points out of 20 points): Identify the correct statement. When you place a negatively charged particle in an electric field, it moves from: 1. higher to lower electric potential and lower to higher potential energy 2. higher to lower electric potential and higher to lower potential energy 3. lower to higher electric potential and lower to higher potential energy 4. lower to higher electric potential and higher to lower potential energy

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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 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 . 4. 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 . 5. Only the charge 1 Q + contributes to the net electric flux through the sphere and to the electric field at point P on the sphere. 6. Only the charge 2 Q + contributes to the net electric flux through the sphere and to the electric field at point P on the sphere. Question D (4 points out of 20 points): Consider an electric dipole immersed in a uniform electric field. Which of the following statements regarding the force F G and the torque τ G is strictly true regardless of the orientation of the dipole: 1. 0 F G and 0 τ G .
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## This note was uploaded on 02/22/2009 for the course 8 02 taught by Professor Sciolla during the Fall '08 term at MIT.

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ps05sol - MASSACHUSETTS INSTITUTE OF TECHNOLOGY Department...

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