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...

Oersted’s Experiment A magnetic field is produced in the surrounding of any current carrying conductor. The direction of this magnetic field can be obtained by Ampere’s swimming rule. SI unit of magnetic field is Wm-2 or T...

Heating Effects of Current When current 1 flows through a conductor of resistance R for a time t then heat generated in it is given by where, V = potential difference applied across the end, of the conductor. Electric Power The...

Electric Current (I) The rate of flow of charge through any cross-section of a wire is called electric current flowing through it. Electric current (I) = q / t. Its SI unit is ampere (A). The conventional direction of electric current is...

Charge Charge is that property of an object by virtue of which it apply electrostatic force of interaction on other objects. Charges are of two types (i) Positive charge (ii) Negative charge Like charges repel and unlike charges...

Deforming Force A force which produces a change in configuration of the object on applying it, is called a deforming force. Elasticity Elasticity is that property of the object by virtue of which it regain its original configuration after...