Question

A capacitor is a square with an angle a = 3cm with a distance between the ammeters e = 2mm. Calculate the capacitance of the capacitor if the electric field is air.

Answer 1

Gives

Square side (a)=3cm

Distance between palate (d)=2mm

Area(A)=$(3\times10^{-2})^2=9\times10^{-4}m^2$

$C=\frac{A\epsilon_0}{d}$

$C=\frac{9\times10^{-4}\times8.85\times10^{-12}}{2\times10^{-3}}$

$C=3.98\times10^{-12}F$

Electric field

$E=\frac{Q}{A\epsilon_0}$

$E=\frac{Q}{9\times10^{-4}\times8.85\times10^{-12}}$

$E=\frac{Q}{7.97\times10^{-15}}$ V/m