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# F16 Ph 333 2.4.1-2.4.4

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## Richard Datwyler

on 8 October 2018

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#### Transcript of F16 Ph 333 2.4.1-2.4.4

Work and Energy
2.4.1 Work to move a charge
2.4.2 Energy of point charges
2.4.3 Energy of charges distribution
2.4.4 Final thoughts
Work
Potential
Work
Field
Force
Point charges
The work to move charge 2 into the potential made from charge 1 would look like
q
q
2
1
3
q
q
4
This is one of those tricky sums that says: "don't double count"
Continuous distribution
IBP
Final Thoughts
can be Negative
Positive
build configuration
Total stored
Both are true
Superposition
practice
+q
-q
2a
a
-q
+q
Work to bring it in (if they are fixed)
How much work to assemble charges
Practice
Find energy in a uniformly charged solid sphere of radius R and charge q.
"Can you please discuss the superposition of electrostatic energy. Particularly how doubling charges can quadruple the energy."
"How does the integration by parts work for 2.4.3 when transferring the derivative from E to V?"
find V first
check it
"It explained it in the book, but in math work, how does the surface integral go away in 2.44?"
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