What is Electrostatic?
The electrostatic potential is referred to the force which is external but conservative. It is the work done by an external force in bringing a charge s from a point r to a point p. It is the difference in the potential energy of charge s between initial and final points.
Potential of a point is referred to the work done per unit charge in bringing a charge from infinity to a certain point.
It is a type of surface over which potential has a constant value. When seen as a point charge, concentric spheres centred at a particular location of the charge are equipotential surfaces.
The potential energy stored in a system is the work done by the external influence in organizing the charges in their locations.
The plates of a capacitor enclose a medium which can be filled with insulating substances, then a net dipole moment is induced by the electric field in the dielectric. This gives rise to the field in the opposite direction.
A capacitor is a system of two conductors separated by an insulating material.
- A spherical conductor has a charge of 4 × 10–8C distributed uniformly on its surface of radius 15 cm. Calculate the electric field just outside the sphere and at a point 15 cm from the center of the sphere.
- Find out the capacitance if the distance between the plates is reduced by half and the parallel plate capacitor has a capacitance of 20 pF (1pF = 10–12 F) with air between the plates.
- What is the total capacitance of the combination Three capacitors each of capacitance 20 pF are connected in series.