When magnetic field is applied perpendicular to a current carrying conductor, then voltage is developed across the conductor in the direction perpendicular to both current and magnetic field. This effect is called Hall effect. Let us consider a rectangular cross…
Moving Coil Galvanometer
Moving coil galvanometer is a device which is used to detect and measure small electric currents present in an electric circuit. Principle It is based on the principle that, “When a current carrying coil is placed in magnetic field, it…
Derivation of Expression for Torque on a Rectangular Coil
Let us consider a rectangular coil PQRS of length ‘l’ and breadth ‘b’ suspended in uniform horizontal magnetic field ‘B’. Let the plane of the coil make an angle ‘θ’ with the direction of magnetic field. When current ‘I’ is…
Multimeter
Multimeter is very useful test instrument. It can be easily and quickly set to be a voltmeter, ammeter or an ohmmeter just by operating a multi-position switch on it. They have several settings (known as ranges) for each type of…
Sources of Electricity
Electricity is one of the most important type of energy that is being used too much widely in the world of present era. Many machines, gadgets, vehicles etc. that make human life easier are run with the help of electricity.…
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