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Chapter_24

# Chapter_24 - Chapte 24 Ele r ctric Pote ntial 24.1 What is...

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Chapter 24. Electric Potential 24.1. What is Physics? 24.2. Electric Potential Energy 24.3. Electric Potential 24.4. Equipotential Surfaces 24.5. Calculating the Potential from the Field 24.6. Potential Dueto a Point Charge 24.7. Potential Dueto a Group of Point Charges 24.8. Potential Dueto an Electric Dipole 24.9. Potential Dueto a Continuous Charge Distribution 24.10. Calculating the Field from the Potential 24.11. Electric Potential Energy of a System of Point Charges 24.12. Potential of a Charged Isolated Conductor

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What is Physics? Gravitational force: F=Gm 1 m 2 /r 2 Electrostatic force: F=Gq 1 q 2 /r 2 One thing is in common: both of these forces are conservative
Electric Potential Energy Gravitational force Electrostatic force Note: Electric energy is one type of energy.

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ReferencePoint of Electric Potential Energy Thereferencepoint can beanywhere. For convenience, weusually set charged particles to be infinitely separated from one another to be zero potential energy Thepotential energy U of thesystem at any point f is where W is the work done by the electric field on a charged particle as that particle moves in from infinity to point f.
Example 1 A proton, located at point A in an electric field, has an electric potential energy of U A = 3.20 × 10 -19 J. The proton experiences an average electric force of 0.80 × 10 -9 N, directed to the right. The proton then moves to point B, which is a distance of 1.00 × 10 -10 m to the right of point A. What is the electric potential energy of the proton at point B ?

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Electric Potential Theelectric potential V at a given point is the electric potential energy U of a small test charge q 0 situated at that point divided by thechargeitself: SI Unit of Electric Potential: joule/coulomb=volt (V) Note: Both the electric potential energy U and the electric potential V are scalars. The electric potential energy U and the electric potential V arenot the same. The electric potential energy is associated with a test charge, while electric potential is theproperty of the electric field and does not depend on the test charge. If we set at infinity as our reference potential energy,
The Electric Potential Difference The electric potential difference between any two points i and f in an electric field. Note: Only the differences Δ V and Δ U are measurable in terms of the work W. The is Δ V property of the electric field and has nothing to do with a test charge The common namefor electric potential difference is "voltage". It is equal to the difference in potential energy per unit charge between thetwo points. the negative work done by the electric field on a unite charge as that particlemoves in from point i to point f.

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Notes Continue Electric field always points from higher electric potential to lower electric potential.
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Chapter_24 - Chapte 24 Ele r ctric Pote ntial 24.1 What is...

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