Question

2. Find the total flux ΦE passing through the sides of a cube 1.00 m on a side if a point charge of 5.00 × 10−6 C is located at its center.

Answer 1

by Gauss's law:

$\Phi_E=q_{in}/\varepsilon_0$

where q_in is charge enclosed by the surface

so,

$\Phi_E=5\cdot10^{-6}/8.85\cdot10^{-12}=5.65\cdot10^5$ N$\cdot$m²/C