1
Physics 208N-004 Lecture #4 – 19 January 2011
Electric Fields – 21-7, 21-8
Review:
1. E-Field – 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. E-field acting on a point charge
6. E-field acting on two point charges
21-7 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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