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Physics Note-I

Electrostatics:  Part-I
Important definitions:

Electric charge: The property of protons and electrons which gives rise to electric force between them is called electric charge.

Relative permittivity or dielectric constant: It is defined as the ratio of the force between two charges placed at a certain distance apart in air to the force between the same two charges placed the same distance apart in that medium.

Electric field intensity: The electric field intensity at a point due to a source charge may be defined as the force experienced per unit positive test charge placed at that point without disturbing the source charge.

Electric field lines:  An electric line of force is the path along which a unit positive charge would move, if it is free to do so.

Electric dipole: A system of two equal and opposite charges separated by a certain distance is called an electric dipole.

Electric dipole moment: It is defined as the product of either charge and the length of the electric dipole.

Gaussian surface: Gaussian surface around a charge distribution is a closed surface such that electric field intensity at all the points on the surface is same and electric flux through the surface is along the normal to the surface.

To be continued..........
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