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Explanation of Discharge Phenomena
Due to cosmic rays and other factor, some ions are always present in a gas. When a potential difference is…
What is DC Motor? What is it used for? Explain it.
A motor is used to convert electrical energy into mechanical energy and rotate a mechanical load. The principle of a…
What is a Hot-Wire Instrument? Explanation
In an ordinary ammeter or voltmeter, a coil is free to rotate in the magnetic field of a fixed magnet.…
What is Alternating Current ( AC )?
When a resistor is connected across the terminals of a battery, a current is established in the circuit. The current…
What is an Induction Coil? How do they work?
An induction coil is used to produce a large emf from a source of low emf. The schematic design of…
What is Eddy Current? Explain it.
Consider a solid plate of metal which enters a region having a magnetic field (figure 38.7a). Consider a loop drawn…
What is Faraday’s Law Of Electromagnetic? Explain it.
Figure (38.1a) shows a bar magnet placed along the axis of a conducting loop containing a galvanometer. There is no…
What is Lenz’s Law? Explain it.
Another way to find the direction of the induced current in a conducting loop is to use Lenz's law. The…
What is an Oscillation Magnetometer? What is it used for? Explain it.
The design of an oscillation magnetometer is shown in figure (36.30). It consists of a rectangular wooden box having glass…
What is a Deflection Magnetometer? What is it used for? Explain it.
A deflection magnetometer consists of a small compass needle A pivoted at the centre of a graduated circular scale. The…