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Physics Note-II

Electric potential: The electric potential at a point in an electric field is defined as the amount of work done per unit positive test charge in moving it from infinity to that point against the electrostatic force due to the electric field.

Equipotential surface: Any surface which has same electrostatic potential at every point is called an equipotential surface.

Dielectric material: Dielectrics are insulators which on applying electric field, induced charges of opposite kinds develop on their opposite faces.

Polar dielectric: A dielectric, in the atom or molecules of which, the centres of gravity of positive and negative charges do not coincide is called a polar dielectric.

Non-Polar dielectric: A dielectric in the atoms or molecules of which, the centres of gravity of positive and negative charges coincide is called a non-polar dielectric.

Electric Capacitance: The capacitance of a conductor may be defined as the ratio of the electric charge on it to its potential due to that charge.

Capacitor: A capacitor is a device for storing a large quantity of electric charge.
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