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## Homework Statement

Estimate the required radius of each plate. The plates are separated in air by 0.01mm and has a capacitance of 400pF. There are 4 pairs of plates.

## Homework Equations

c= εrε0*A(n-1)/ d

## The Attempt at a Solution

Find area. Transposing for AA = dc/εrεo

A= 1*10^-5*400*10^-12/1*8.85*10^-12*7

I am getting 6.457^-27mm.

I am going wrong somewhere, pretty sure the equation is correct though.