Question

1. When a cylindrical capacitor is given a charge of 0.500 nC, a potential difference of

20.0 V is measured between the cylinders.

a.

What is the capacitance of this system?

Answer 1

$$C=\frac{q}{U}\\C=\frac{0.5\cdot10^{-9}}{20}=2.5\cdot10^{-11}\ F$$