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Electric Field Question

by BlueCardBird
Tags: electric field, electric field lines
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Dec17-12, 08:25 PM
P: 25
For the equation ε=ΔV/r, does this work only between 2 parallel plates or would it work for point charges as well?
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Dec18-12, 10:26 AM
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Electric Field Question

Do you know calculus? Your equation seems to be another way of writing [itex]|E| = \Delta V/\Delta r[/itex], which is only an approximation. The correct value is gotten by taking the limit as Delta goes to 0. Then you get:
[itex]E=-\nabla V[/itex]
In the special case of infinite parallel plate, they give the same answer, but for a curved E field you get a more accurate answer for smaller step size.

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