Lecture 4
Electric Potential

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New Concepts:
•
Electric potential
•
Electric potential energy
•
Potential due to a point charge
•
Potential due to a group of point charges
–
superposition
•
Potential due to an electric dipole
Additional skills to learn:
•
Calculating the electric potential from the field
•
Calculating the field from the potential

( )
Consider an electric charge
moving from
an initial position at point A to a final position at
point B under the influenc
f
i
x
f
i
x
o
U
U
U
W
F x dx
q
Electric Potential Energy :
e of a known electric field
.
The force exerted on the charge is:
o
f
f
o
i
i
E
F
q E
U
F ds
q
E ds

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A
B
P
P
V
E ds
Electric Potential V
Units of :
J/C
known as the "Volt"
V