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CH 16 HW 4 F2008
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CH 16 HW 4 F2008 (Homework)
BAKER KRISTINE NICOLE
PY 208M, section 004, Fall 2008
Instructor: Laura I. Clarke
Web
Assign
Current Score:
19 out of 29
Due:
Friday, September 26, 2008 12:30 PM EDT
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
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) What is the maximum possible potential of a metal sphere of
14
cm radius in air? (That
is, what is the potential at the surface of the sphere, relative to infinity?)
420000
4.20e+05
volts
(b) What is the maximum possible potential of a metal sphere of only
0.8
mm radius?
2400
2400
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. 8/8 points
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CH 16 HW 4 F2008
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Figure 16.70
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 Spring '08
 Chabay

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