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## Homework Statement

[PLAIN]http://img101.imageshack.us/img101/2786/21417885.png [Broken]

[96]

## Homework Equations

## The Attempt at a Solution

E= kdq/r^2

dq=Q/(pi a) dx

Ex = 0 , Ey= E sintheta

sin theta = sqrt(a^2 - x^2)/a by Pythagorean theorem

Ey = kQ/(pi a* a^3) integral from -a to a sqrt(a^2 - x^2)dx

= kQ/(pi a^4) *pi a^2/2= kQ/2a^2 but in the manual it says E= 2kQ/pi*a^2

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