Question

a sheet of polythene(er=1.3) and 0.5mm thickis to be used in capacitor by sandwiching it two sheet of aluminum foil.what area must sheets have

Answer 1

Solution

$C=\frac{\epsilon_r\epsilon_0A}{d}$

$\therefore\>A=\frac{5×10^{-6}×0.5×10^{-3}}{8.85×10^{-12}×1.3}$

$=217.3m^2$