What is electrostatics?

What is electrostatic shielding? What is its importance?

What is electrostatic force?

What is the use of Gaussian surface in electrostatics ?

A 400 pf capacitor is charged by a 100 V battery. How much electrostaic energy is stored by the capacitor ? The capacitor is disconnected from the battery and connected to antoher 400 pF capacitor. What is the electrostatic energy stored by the system?

Two charges -q and +q are located at points (0, 0, -a) and (0, 0, a), respectively. What is the electrostatic potential at the points (0, 0, z) and (x, y, 0) ?

Two charges -q and +q are located point (0, 0, -a) and (0, 0, a) respectively: What is the electrostatic potential at the points (0,0,z) and (x,y,0) ?