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Electricity & Megnetism

Coulomb’s law examples and problems

“Coulomb’s law states that  force of attraction or repulsion between two electric charges is directly proportional to their magnitudes and inversely proportional  to the square of distance between them”.Coulomb’s law examples are given below. Charles Agustin Coulomb (1736-1806) measured electrical attractions and repulsion  quantitatively and deduced the law that governs them.His apparatus,shown in fig. This figure resembles the figure given ...

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Gauss’s law and its applications

 Gauss’s law states that: “The total electric flux through any closed surface  is equal to 1/ε0 times the total charge enclosed by the surface.”Gauss’s law applications are given below. It is given by Karl Friedrich  Gauss ,named after him gave a relationship between electric flux through a closed surface and the net charge enclosed by the surface.It is applied to calculate ...

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What is difference between electric potential and potential difference?

Electric potential at a point in an electric field is equal to the amount of  work  done in bringing a unit positive charge from infinity to that point.While Potential difference is the work done in carrying a unit positive charge from one point to another point while keeping the charge in equilibrium.Electric potential and potential difference both have same unit ...

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Difference between mutual and self induction

image of self induction of a coil

The process in which a changing current in one coil induces emf in other coil,is called mutual induction.While the phenomenon in which a changing current in a coil induces an emf in itself is called self induction. What is Mutual induction? “The process of inducing e.m.f in the secondary coil by changing the magnetic flux of the primary coil with ...

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Difference between potentiometer and voltmeter in tabular form

Voltmeter is used to find potential difference,it has high and finite resistance.While potentiometer has high and infinite resistance.More difference between potentiometer and voltmeter are given in comparison table below. Potentiometer Vs Voltmeter Voltmeter Potentiometer Its resistance is high and finite Its resistance is high and  infinite It draws some current from emf source It does not draw any electric current ...

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types of electromagnetic radiation in order of increasing wavelength

There are 7 types of electromagnetic radiation which are given in the  list below: Light Infrared radiation Microwaves radiations X-rays Ultraviolet radiations Radiowaves Gamma rays What is Electromagnetic Spectrum? The word spectrum comes from a Latin word meaning “form” or “appearance”. Other familiar words from the same root include “spectacle” and “species.” Newton introduced word to describe the rainbow-like image ...

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State faraday’s law of electromagnetic induction

Faraday’s law of induction was discovered through experiments carried out by Micheal Faraday in England In 1831 and by Joseph Henry in the United States at about the same time. *Even through Faraday published his results first, which gives him priority of discovery, the SI unit of inductance is called the henry (abbreviation H). On the other hand, the SI ...

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Difference between resistance and resistivity in tabular form

Resistance and resistivity difference                     Resistance                          Resistivity  It is the opposition to the flow of electric current through a conductor. It is the resistance of a meter cube of a wire. Its SI unit is ohm ( Ω ). Its ...

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Ammeter and voltmeter

An ammeter is an electrical device which is used to measure the current. It is the modified form of the galvanometer. It is a low resistance galvanometer. It is always connected in series with the circuit to measure current. An ideal ammeter has zero resistance. Meter movement The portion of galvanometer whose motion causes the needle of the device to ...

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Difference between electric and magnetic field

The difference between electric and magnetic field is that “Electric field is the area around the charged particles,it was introduced by Michel Faraday.While,magnetic field is the area or region around the magnetic where poles of magnet shows force of attraction or repulsion.More differences about electric field and magnetic field  are given in the comparison table below. Electric field Vs Magnetic ...

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