Lecture 3
Calculation of the E-fields of continuous charge distributions.
1
Example: An infinite line of charge lies along the x-axis. The
line has a uniform charge per unit length of +. What is the
E-field at point P? The coordinates of P are (0,a).
y
P

Lecture 2
Coulombs Law
The Electric Field
1
Coulombs Law
The magnitude of the force
between two point charges is:
F=
k q1 q2
r
2
.
q1 and q2 are the charges and r is the separation between
the two charges.
9
2
k = 8.99 10 Nm /C
where k =
1
4 0
2
and 0 = 8

Lecture 5
Vector area
The unit normal
Definition of flux
Gausss Law
Application of Gausss law
Conductors
1
Flux is flow through an area.
A = An
Define
A is the area of the surface
n
is the outward directed unit
vector normal to the surface
2
Example

Lecture 6
Electric potential energy
Electric potential
Equipotential surfaces
The relationship between E and V
1
Recall from PHY 121 (see chapter 7):
The work by a force F in moving between two points a
and b is
b
Wa b = F dl
a
If the work is done by