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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.,...
Magnetic dipole moment of a revolving electron

Magnetic Dipole Moment of a Revolving Electron

According to Neil Bohr’s atom model, the negatively charged electron is revolving around a positively charged nucleus in a circular orbit of radius r....
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...
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

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...
Force between two parallel current-carrying conductors – definition of ampere

Force between two parallel current-carrying conductors – definition of ampere

AB and CD are two straight very long parallel conductors placed in air at a distance a. They carry currents I1 and I2 respectively.(Fig 3.23) The...
Torque experienced by a current loop in uniform magnetic field

Torque experienced by a current loop in uniform magnetic field

Let us consider a rectangular loop PQRS of length l and breadth b (Fig). It carries a current of I along PQRS. The loop is placed in a...
Combination of cells in series

Combination of cells in series And Parallel

 Combination of cells in series When external resistance is negligible in comparison to the internal resistance, then the cells are connected in parallel to get maximum...
Current loop as a magnetic dipole

Current Loop as a Magnetic Dipole

Magnetic dipole: An arrangement of two equal and opposite magnetic poles separated by a small distance is called a magnetic dipole. Magnetic dipole moment: The magnetic dipole...
Torque on a bar magnet placed in a uniform magnetic field

Torque on a Bar Magnet Placed in a Uniform Magnetic Field

Consider a bar magnet NS of length 2l and pole strength m placed in a uniform magnetic field of induction B at an angle θ...