Physics 122 Unit 1
Electrostatics
Review
Coulomb's Law
From Coulomb's Law to the Electric Field
q1
q2
Q
q3
and
From Coulomb's Law to the Electric Field
q1
q2
Q
q3
and
The Electric Field from Point Charges
The Electric Field from an Integral
The Electric Field from an Integral
The Electric Field from an Integral
Problem 23-28
The Electric Field from an Integral
Problem 23-29
Gauss's Law
Faraday's Lines of Force
The Inverse Square Law
Flux
“The NUMBER of Electric Field Lines”
Electric Field
“The DENSITY of Electric Field Lines”
Area
Flux through a Sphere
It's the same Flux through ANY
surface that encloses the
charge!
The Net Flux is Zero for any closed
surface for charges outside the surface
Gauss's Law
Net Flux
And also,,,
Electric Fields and Metals
E is
perpendicular to
the metal surface
E=0
Inside!
Problem 24-47
Energy Principles
Electric Potential - Voltage
Energy Methods
Energy Methods
Energy Methods
The Electric Potential
The Electric Potential Energy
Energy Methods
Where
Change in Electric Potential
Change in
Electric Potential Energy
Electric Potential of a Point Charge
We define the Electric Potential to be zero at
The Electric Potential of a Point Charge
Electric Potential
Energy
Electric Potential
From Problem 3:
Inside:
Outside:
Metals form Equipotential Surfaces
All points on a connected metal surface have the same V!
Finding E from V
y
x
Capacitors
The Parallel Plate Capacitor
Energy Stored in a Charged Capacitor
Energy Density