Maximum plate separation for a capacitor with 220V and 0.375 m² plates

[purduegirl]

Homework Statement

You must design a capacitor capable of storing 4.50 × 10-7 C of charge, but you only have a 220- V power supply and two metal plates of area 0.375 m2 each. What is the largest value the plate separation can be so that you can accomplish the task?

Homework Equations

V = Q*d/A*epilson 0

The Attempt at a Solution

I solved for d, and got 1.62E-2 m. Again, don't know what I am doing wrong here.

 

[alphysicist]

Hi purduegirl,

That's not quite the answer I get from your equation. Why don't you calculate it again; if you still get the same thing, please show what equation you got when you solved for d and then exactly the numbers you plugged in your calculator.