ELECTRICAL B PREPADED BY PRITESH DESAI SWATI GAJERA

ELECTRICAL B

PREPADED BY: PRITESH DESAI SWATI GAJERA VISHAL GANGADIYA VIVEK GARALA BHAVESH GAUDANI SANKET GOSWAMI DILIP GANGADIYA SUMIT GODHANIYA ALPHESH HADIYA AKSHa. Y HARIYA 2

ELECTROSTATIC AND CAPACITANCE

!! Positive charge !! Negative charge

COULOMB INVERSE SQUARE LAW: Charles Augustin de Coulomb in 1785. Coulomb first law: Coulomb Second law: F=A. q 1. q 2/r. r

Electric Field: It define as a line along which a free positive charge would travel if it is placed in an electric field. Electric Flux: Unit = Coulomb. Electric flux 0 = Q coulombs(numerically)

D= O/A D= Q/A Unit = C/m. m Also called displacement density.

E= F/Q Relation between Flux Density and Electric Field Intensity: - D = k. E

It is defied as the ease with which a dielectric material acting as a medium, allows the electric flux to be established in it. Є0 = D/ E F/m in vaccum of free space

The rate of change of potential with distance is called potential gradient. g = dv/dx

A Capacitor is formed if two conducting surface or plates are separted by an insulating medium called dielectric.

!! Fixed Capacitors !! Variable Capacitors

Capacitance: - Unit = Farad. 1 - Farad: It is defined as the Capacitance which needs a charge of 1 - coulomb to obtain a potential difference of 1 -volt across its plates.

C=

Unit = V/m. Factor affecting the dielectric strength: !! Temperature. !! Moisture content. !! Thickness of the material. !! Size and shape of the plates used.

1/Ceq = 1/c 1+1/c 2+…………. 1/cn Ceq = C 2. C 1/(c 1+ c 2)

Capacitors in Parallel: -

TYPES OF CAPACITORS: @ Air Capacitors. @ Paper Capacitors. @ Mica Capacitors. @ Ceramic Capacitors. @ Poly carbon capacitors. @ Electrolytic Capacitors.

presented BY: PRITESH DESAI VIVEK GARALA & SWATI GAJERA

GUIDE BY: Prof. RAHUL CHANDEGRA 20

d n E e h T 21