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## Homework Statement

This is the question

Structure opposite comprises 5 ions each of which has lost one electron. The sides of the square formed by the 4 outer ions are of length 0.2nm

Ion E is at the midpoint

1.What is the force on A due to ion A?

## Homework Equations

I'd imagine: F= kq / r^2

## The Attempt at a Solution

I used Pythagoras to get A to E which is 0.141nm which is r

but for the charge would I use 1.6*10^19 even though they've lost an electron?

9*10^9 * 1.6*10*-19 / (0.141*10^-6)^2

I don't think this is right