Question

3-) Two parallel conducting plates have charges of +2x10-6C and -2x10-6C when connected to a potential difference of 10 v. 3-a) Determine the capacitance of this system. 3-b) Determine the stored energy in this capacitor.

Answer 1

3-a)

  

Capacitance C = 9 V

$C = \frac{2\times 10^{-6}}{10}$

C=0.2uF

3-b)

Energy stored

  $U = \frac{1}{2}CV^2$

  $U = \frac{1}{2}\times 0.2\times10^{-6}\times10^2$

$U = 10\ \mu J$