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Physics 208N004 Lecture #4 – 19 January 2011
Electric Fields – 217, 218
Review:
1. EField – force acting at a distance
2. Field is due to force exerted on a tiny positive charge
E
=
F
/q
3. Force on test charge
4. Photocopy machine
5. Efield acting on a point charge
6. Efield acting on two point charges
217 Electric Field Calculations for
Continuous Charge Distributions
A continuous distribution of charge may be treated as
a succession of infinitesimal (point) charges. The
total field is then the integral of the infinitesimal fields
due to each bit of charge:
Remember that the electric field is a vector; you
will need a separate integral for each component.
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217 Electric Field Calculations for
Continuous Charge Distributions
Example 219: A ring of charge.
A thin, ringshaped object of radius
a
holds a total
charge
+
Q
distributed uniformly around it. Determine
the electric field at a point
P
on its axis, a distance
x
from the center. Let
λ
be the charge per unit length
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This note was uploaded on 09/18/2011 for the course PY 208M 87878 taught by Professor George during the Spring '09 term at N.C. State.
 Spring '09
 GEORGE

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