CH17-HW04-FALL2010

CH17-HW04-FALL2010 - 1 2/14/11 CH17-HW04-FALL2010 Rachel...

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12/14/11 CH17-HW04-FALL2010 1/5 www.webassign.net/web/Student/Assignment-Responses/last?dep=3173273 Current Score : 30 / 30 Due : Sunday, October 9 2011 11:59 PM EDT 1. 4/4 points | Previous Answers MI3 17.7.P.094.alt01 A highly charged piece of metal (with uniform potential throughout) tends to spark at places where the radius of curvature is small, or at places where there are sharp points. The breakdown electric field strength for air is about 3 10 6 V/m. (a) It is possible to calculate the maximum possible potential (relative to infinity) in air of a metal sphere of 12 cm radius. First, what is the maximum charge you can put on this sphere? 4.8e-6 4.80e-06 C For that amount of charge, what is the potential of the sphere relative to infinity? 3.6e5 3.60e+05 volts (b) Next, calculate the maximum possible potential relative to infinity in air of a metal sphere of only 0.4 mm radius. What is the maximum charge you can put on this sphere? 5.3e-11 5.33e-11 C For that amount of charge, what is the potential of the sphere relative to infinity? 1200 1200 volts These results are related to the fact that if a piece of metal has a small radius of curvature, it will spark at relatively low potential relative to infinity. Solution or Explanation At the surface of the sphere, E = 3e6 V/m. Solve for q, then find V at the surface of the sphere. Read the eBook Section 17.7 2. 7/7 points | Previous Answers MI3 17.6.P.082 CH17-HW04-FALL2010 (Homework) Rachel Pereira PHYS 272-Fall 2011, Fall 2011 Instructor: Virendra Saxena Web Assign The due date for this assignment is past. Your work can be viewed below, but no changes can be made.
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CH17-HW04-FALL2010 - 1 2/14/11 CH17-HW04-FALL2010 Rachel...

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