A point charge is placed at the centre of spherical Gaussian surface. Is electric flux `phi_(E)` changed if
(a) The sphere is replaced by a cube of same or different volume ?
(b) The charge is moved off-centre in the original sphere, still remaining inside ?
( c ) The charge is moved just outside the original sphere ?
(d) A second charge is placed near the outside to the origianl sphere ?
(e) A second charge is placed inside the Gaussian surface ?

Explanation

To solve the problem step by step, we will analyze each part of the question regarding the electric flux through a Gaussian surface when different scenarios are applied.

### Step-by-Step Solution:

1. **Understanding Electric Flux and Gauss's Law**:
- Electric flux (\( \Phi_E \)) through a closed surface is given by Gauss's Law:
\[
\Phi_E = \frac{Q_{\text{enc}}}{\varepsilon_0}
...