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CH 16 HW 4

CH 16 HW 4 - CH 16 HW 4 S2009(Homework Current Score 17/29...

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CH 16 HW 4 S2009 (Homework) Current Score: 17/29 Due: Friday, February 13, 2009 12:30 PM EST About this Assignment Extension Requests Question Points 1 2 3 4 4 6/8 7 0/10 Total 17/29 Description Potential at a location; potential differences in regions with varying fields; potential and field inside an insulator The due date for this assignment is past. Your work can be viewed below, but no changes can be made. 1. 4/4 points All Submissions Notes Question: MI2 16.P.45 Question part Points Submissions 1 2 2 2 1/3 1/3 Total 4/4 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.

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(a) What is the maximum possible potential of a metal sphere of 19 cm radius in air? (That is, what is the potential at the surface of the sphere, relative to infinity?) 570000 5.70e+05 volts (b) What is the maximum possible potential of a metal sphere of only 0.4 mm radius? 1200 1200 volts 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. 2. 6/8 points All Submissions Notes Question: MI2 16.P.62 Question part Points Submissions 1 2 3 4 5 2 2 1 1 0/2 1/3 2/3 1/3 2/3 2/3 Total 6/8
Figure 16.70

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CH 16 HW 4 - CH 16 HW 4 S2009(Homework Current Score 17/29...

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