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**1. The problem statement, all variables and given/known data**

The charge center of a thundercloud, drifting 3.0km above the earth's surface, contains 20 C of negative charge.

Assuming the charge center has a radius of 1.0km Calculate the Capacitance of the system.

**2. Relevant equations**

C=8.85*(10^(-12))*A/d

Where A is the area, D is the separation distance

**3. The attempt at a solution**

Basically I just used the formula and plugged and chugged because of the large sizes, we can ignore the curvature and treat it as parallel plate capacitors.

8.85*10^(-12)*4∏(1000)^2/3000

This however gave me the wrong answer, I'm not really sure where to go from here since this path was wrong.

I hope there isn't a limit to how many questions you can ask in a day :P