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# Electricity & Megnetism

## formula for total capacitance in series and parallel combination

Formula of equivalent capacitance in series Series combination when capacitors are connected in series,the total capacitance is less than the smallest capacitance value because the effective plate separation increases.The calculation of total series capacitance is analogous to the calculation of total resistance of parallel resistors. This type of combination has the following characteristics: Each capacitor has the same charge across ...

## Inductor and inductance:types and applications

What is Inductor and what does it do? When a length of wire is formed into a coil,it becomes a basic inductor. The term coil and inductor are used interchangeably.Current through the coil produced an electromagnetic field, as illustrated. The magnetic lines of force around each loop (turn) in the winding of the coil effectively add to the lines of ...

## Magnetic flux density:Definition,unit,formula and applications

Magnetic Flux definition The group of force lines going from the north pole to the south pole of a magnet is called the magnetic flux, symbolized by Φ (the Greek letter phi). The number of lines of force in a magnetic field determines the value of the flux. The more lines of force, the greater the flux and the stronger the magnetic ...

## what is Difference between induced emf and induced current?

There are many ways to produced induced emf figure illustrated one of them. Consider a straight piece of wire of length l placed in the magnetic field of a permanent magnet. The wire is connected to a sensitive galvanometer. This forms a closed path or loop without any battery. In beginning when the loop  is at rest in the magnetic ...

## Maxwell’s equations:Derivation in integral and differential form

The 4 Maxwell equations The basic equations of electromagnetism which are collection of Gauss’s law for electricity ,Gauss’s law for magnetism ,Faraday’s law of electromagnetic induction and Ampere’s law for currents in conductors are called Maxwell’s equations. These equations are part of comprehensive and symmetrical theory of electromagnetism,which is essential to understand electromagnetic waves,optics,radio and TV transmission,microwave ovens and magnetically ...

## Resistance in series and parallel circuits

Combinations of resistance in electric circuit There are two possible combinations of resistance in electric circuits: Series combination Parallel combination Series combination In series combination,resistors are connected end to end and electric current has a single path through the circuit.This means that the current passing through each resistor is the same. The current is the same through all points in ...

## Inductance of a toroid formula derivation and examples

What is toroid? The solenoid bent into circular shape is called toroid. Inductance of a toroid derivation Consider a toroid having rectangular cross sectional area.The inner radius of the toroid is ‘a’ while outer radius is b.The number of turns of toroid is N.Let i be the current flowing through each turn of toroid. The magnetic field lines inside the ...

## chemical effects of electric current

Chemical effects of current Voltmeter or coulomb meter: The vessel in which electrolytes is carried out.It is also called electrolytic cell. Electrolyte: An ionic compound in aquas solution or molten state is called an electrolyte. Electrolysis: On passing current through an electrolyte,chemical changes occur in electrolyte and substances are liberated at the electrodes.This process is called electrolysis. Faraday’s laws: First ...

## coulomb’s and newton’s gravitational law: differences and similarities

Coulomb’s law Newton’s law of gravitation Comparison of Coulomb’s law and Newton’s law of gravitation The electrical force between two charges is directly proportional to the product of their charges and inversely proportional to the square of the distance between them:It is expressed The gravitational force between two masses is directly proportional to the product of their masses and inversely ...

## biot savart law:definition, examples, problems and applications

What is the definition of biot savart law? “The magnetic induction at any point produced by current element is directly proportional to the product of the current and the differential element and inversely proportional to the square of distance of the point from the differential element.” Formula of Biot Savart law [latex]\dB=\frac { { \mu  }_{ 0 } }{ 4\pi ...