Lecture06_Kim

Lecture06_Kim - Lecture 6-1 Electric Potential Energy of a...

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Lecture 6-1 Electric Potential Energy of a Charge in Electric Field Coulomb force is conservative => Work done by the Coulomb force is path independent . an associate potential energy to charge q 0 at any point r in space. () Ur It’s energy! A scalar measured in J (Joules) dl 0 dW q E d l Work done by E field 0 dU dW q E dl     Potential energy change of the charge q 0

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Lecture 6-2 Electric Potential Energy of a Charge (continued) 0 dW q E d l 0 ( ) ( ) r i U U r U i q E dl  0 dU dW     i is “the” reference point . Choice of reference point (or point of zero potential energy ) is arbitrary. 0 dl i is often chosen to be infinitely far ( )
Lecture 6-3 Gravitational vs Electrostatic Potential Energy ( ) ( ) b a U U b U a d F l  a b qE mg Gravity Coulomb Work done by <gravity/Coulomb> force is the decrease in potential energy. mg l  qE l (if g, E uniform)

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Lecture 6-4 Potential Energy in the Field due to a Point Charge q 0 0 2 0 2 00 () P P r r U r q E dl qq k r dl l k dl l q q q q kk lr       From ∞ This is also called the potential energy of
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Lecture06_Kim - Lecture 6-1 Electric Potential Energy of a...

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