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## Homework Statement

You have a semicircle of radius R and charge Q. We also have available a test charge +qo.

Find the Magnitude and direction of the electric field at the origin.

## Homework Equations

Electric Field:

F = k (Q * qo)/(R^2)

E = F/qo = kQ/R^2

## The Attempt at a Solution

I'm not sure how to solve this, I assumed it would be kQ/R^2 but I am mistaken. Can someone please explain? I'm looking for an explanation on line but not having any luck