25.3V&UDuetoPointCharges
Onlythepartsofthepath
(fromAtoB)thatare
parallelto Econtributeto
thepotential
Sothepotentialatadistancerfromapointchargeqis:
Title:Feb208:03AM(1of9)
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Examples on Electric Potential, Capacitance and Dielectric | PHYS 2120, Study notes of Physics
Material Type: Notes; Professor: Farris; Class: Calculus Based Physics II; Subject: Physics; University: Volunteer State Community College; Term: Unknown 1989;
Typology: Study notes
Pre 2010
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25.3 V & U Due to Point Charges
Only the parts of the path
(from A to B) that are
parallel to E contribute to
the potential
So the potential at a distance r from a point charge q is:
If we bring a 2nd point charge into the vicinity of the first, we
can have the potential energy of the system of the two point charges:
If we have a collection of charges, the potential at any point is
just the sum of the potentials of the individual charges.
25.4 Obtaining the Electric Field from a Potential
For example: For a point charge...
25.5 V Due to a Continuous Charge Distribution
25.6 V Due to a Charged Conductor
In a charged conductor, the potential is the same everywhere inside & on the conductor
The surface of the conductor is an equipotential surface.
#1: E = 0 inside the conductor.
- The E is also zero everywhere inside a cavity in conductor.
This is the idea behind a Faraday cage a metal enclosure used to protect something inside from external E fields (or to protect the exterior from fields inside the cage.
Ch 26 Capacitance & Dielectrics
26.1 Definition of Capacitance Two conductors carrying equal but opposite charges together form a capacitor. We define the capacitance, C, as the charge stored per unit potential.
We get a new unit (yea!)
1 farad is huge! We'll usually use
Example: If two conductors that will each hold +/ 2.00 μC with a potential difference of 1.50 V, find the capacitance.