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12th physics. NCERT notes

AC Generator

AC Generator: AC generator is the one which produces a current that alternates or changes its direction regularly after a fixed interval of time, i.e.,...
Bar magnet as an equivalent solenoid

Bar Magnet as an Equivalent Solenoid

To demonstrate the similarity of a current carrying solenoid to a bar magnet, let us calculate axial field of a finite solenoid carrying current. Consider:...
12th physics. NCERT notes

Astronomical Telescopes

Astronomical Telescopes It is used to observe distinct images of heavenly bodies. It consists of 2 lenses, the objective lens O of large focal length and...
chemistry 12th class cbse notes

Physical & Chemical properties of Phenols

Physical properties of Phenols Phenols are colourless liquids or crystalline solids but become coloured due to slow oxidation with air. Due to the presence...
12th physics. NCERT notes

Hertz experiment

The principle of Hertz experiment: The existence of electromagnetic waves was confirmed experimentally by Hertz in 1888. This experiment is based on the fact that...
chemistry 12th class cbse notes

Uses of inert gases

Helium is used: Gas cooled Nuclear reactors In filling balloons for meteorological observations. In the oxygen mixture of deep sea divers In inflating aeroplane...
12th physics. NCERT notes

LC Oscillations

When a charged capacitor is allowed to discharge through a non-resistance, electrical oscillations of constant amplitude and frequency are produced. These oscillations are called...
12th physics. NCERT notes

Transformer

A transformer is an electrical device used for converting low alternating voltage into a high alternating voltage and vice versa. It transfers electric power...
Dielectrics and Polarisation

Dielectrics and Polarisation

Dielectrics Dielectrics are non-conducting substances. In contrast to conductors, they have no or the negligible number of charge carriers. In a dielectric, free movement of...
Magnetic Field Intensity due to a Magnetic Dipole

Magnetic Field Intensity Due to a Magnetic Dipole

Magnetic field intensity at a general point having polar coordinates (r,θ) due to a short magnet is given by Special Cases: At axial point θ...