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Jen2114
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Homework Statement
A nonconducting disk of radius R has a uniform positive surface charge density sigma. Find the Electric field at a point along the axis of the disk at a distance x from its center. Assume that x is positive
Homework Equations
E=kq/r
The Attempt at a Solution
I know I'm suppose to find dEX for one ring and then integrate to find the field due to all the rings.
dEx= (k) (2πσrx)dr /(x^2 +r^2) ^3/2
Why should you integrate this component from 0 to R and not R to -R