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Electricity & Megnetism

Electric current definition

What does electric current mean? “Current is rate of flow of charges through any cross sectional area.”It is produced due to the flow of either positive charge or negative charge or both of charges at the same time.Its formula is given as:If the charge Q is passing through any area in time t,then current I will be: I=Q/t Unit of ...

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What is Capacitance of capacitor's?

What is capacitance of capacitors? “Capacitance is the amount of charge that a capacitor can store per unit of voltage across its plates.”It is denoted by C.That is capacitance is a measure of a capacitor’s ability to store charge.The more charge per unit of voltage that a capacitor can store,the greater its capacitance,its formula is given as: C=Q/V Where C ...

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Capacitor and capacitance

What is capacitor? “A capacitor is device that can store charge.”Apart from resistors and inductors a capacitor is the other basic component commonly used in electronic circuits.It is a device which  has the ability to store charge which neither a resistor nor an inductor  can do , it opposes any change of voltage in the circuit in witch it is ...

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Electric Potential

Electric Potential: ”  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.”If  W  is the work done in moving a unit positive charge from infinity to a certain point in the field ,the electric potential V at this point would be ...

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GAUSS’S LAW for electricity and magnetism

What is Gauss’s law?                                            Gauss’s law can be defined as: “The total electric flux through any closed surface  is equal to 1/ε0 times the total charge enclosed by the surface.” It is given by Karl Friedrich  Gauss ,named after ...

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Electric and magnetic flux

What is Electric Flux? “Total number of field lines passing through a certain element of area is called flux”. It may also be defined as “The scalar product of electric field intensity E and vector area  A“.It is denoted by Greek letter Φ. Φ=E.A Φ=EAcosθ Where θ is the angle between E and A.Electric flux is a scalar quantity.Its SI unit Nm²/c.Below figure ...

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Electric Field Lines

Electric Field Lines: A visual representation of the electric field can be obtained in terms of electric field lines;an idea proposed by Michael Faraday.Electric field lines can be thought of a “map” that provides information about the direction and strength of the electric field at various places.As electric field lines provide information about the electric force exerted on a charge ...

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What are the two types of Electric Charge

What is Electric Charge? Electric charge is defined as:”An electrical property of matter that exists because of an access or a deficiency of electrons.” If you walk across a carpet in dry weather,you can draw a spark by touching a metal door knob.On a grander scale,lightning is familiar to everyone.Such phenomena suggest the vast amount of electric charge that is ...

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Coulomb’s Law definition

What is Coulomb’s law? “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”.It is mathematically explained as: Charles Agustin Coulomb (1736-1806) measured electrical attractions and repulsions  quantitatively and deduced the law that governs them.His apparatus,shown in fig. This figure resembles ...

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