Displacement Current It is a current which produces in the region in which the electric field and hence the electric flux changes with time. Displacement current, ID = εo . dφE / dt where, φE is the...

It is the branch of science which deals with the electron flow through a vacuum, gas or semiconductor. Classification of substances on the basis of conduction of electricity. Solid We know that, each substance is composed of atoms....

Nucleus The entire positive charge and nearly the entire mass of atom is concentrated in a very small space called the nucleus of an atom. The nucleus consists of protons and neutrons. They are called nucleons. Terms Related to...

Dalton’s Atomic Theory All elements are consists of very small invisible particles, called atoms. Atoms of same element are exactly same and atoms of different element are different. Thomson’s Atomic Model Every atom is...

Cathode Rays Cathode rays are the stream of fast moving electrons. These rays are produced in a discharge tube at a pressure below 0.01 rom of mercury. Properties of Cathode Rays (i) Cathode rays are not electromagnetic rays. (ii)...

Wave optics describes the connection between waves and rays of light. According to wave theory of light, the light is a form of energy which travels through a medium in the form of transverse wave motion. The speed of light in a medium depends upon...

Light Light is a form of energy eyes. which produces the Sources of light are of three types-thermal sources and luminescent sources. Photometry is a branch measurement of light energy. Characteristics of Light Light waves...

Transient Current An electric current which vary for a small finite time, while growing from zero to maximum or decaying from maximum to zero, is called a transient current. Growth of Current in an Inductor Growth of current in an inductor...

Whenever the magnetic flux linked with an electric circuit changes, an emf is induced in the circuit. This phenomenon is called electromagnetic induction. Faraday’s Laws of Electromagnetic Induction (i) Whenever the magnetic flux...

The property of any object by virtue of which it can attract a piece of iron or steel is called magnetism. Natural Magnet A natural magnet is an ore of iron (Fe3O4), which attracts small pieces of iron, cobalt and nickel towards...