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## Homework Statement

Determine both the location and the maximum magnitude Emax of the electric field along the axis of a uniformly charged ring. (Use epsilon_0 for ε0, Q, and a as necessary.)

## Homework Equations

dE= k_edq/r^2costheta

costheta= x/r

## The Attempt at a Solution

i think i have to take the derivative of some forumla

that looks like this:

(kex)/(a^2 + x^2)^3/2 all multiplied by Q

and set this to zero and find a max

i really have no idea how to do this