Question

An electric charge of 8.85 x 10-13 C is placed at the centre of a 

sphere of radius 1m. What is the total electric flux linked with the 

sphere? How will the electric flux change if another equal and 

dissimilar charge is introduced at a distance of (i) 0.5m from the 

centre, (ii) 1.5m from the centre?

Answer 1

$$\Phi=\frac{q}{\epsilon_0}\\\Phi=\frac{8.85\cdot10^{-13}}{8.85\cdot10^{-12}}=0.1\ Vm$$

1)

$$\Phi'=0\ Vm$$

2)

$$\Phi''=\Phi=0.1\ Vm$$