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## Homework Statement

The capacitance of a spherical condenser is 1uF. If the spacing between the two spheres is 1mm, then what is the radius of the outer sphere

## Homework Equations

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C = 4 pi Epsilon * ab/b-a (for a spherical capacitor)

## The Attempt at a Solution

Given C = 1uF (u = 10^-6)

b-a = 10^-3

1uF = 4 pi Epsilon * ab/10^-3

On solving

9 = ab

How do I proceed forward from here? Please help