Electrostats

Mass of electron

9.1 × 10^(-31) kg

Mass of proton

1.67 × 10(-27) kg

Mass of neutron

1.67493 × 10^(-27)kg

Coloumbs force

Kq¹q¹/r²

Quantization of charge

Q=n×e

‘e’ is charge on an electron, ‘n’ is integer.

Electric field due to charged ring

Electric field due to line charge of..

1. Finite lenght

2. Semi-infinite lenght

3. Infinite length

Electric field due to charged disc/sheet

Electric field due to charged sphere

1. Conductor(behaves as a shell-charges move to surface)

2. Non-conductor(solid)

Electrostatic potential due to

1. Point

2. Ring

3. Shell

4. Solid sphere

Change in P.E per unit test charge

Electrostatic potential Energy due to…

1. Point charge

2. Shell

3. Solid sphere

   Note: P.E of shell and solid sphere is called self-energy!!

We define, electric potential energy of the system as negative of the work done by the electric forces as the configuration of the system changes.

Relation between electric field and potential

Electric dipole

P=qd

Dirñ is -ve to +ve.

Vector quantity

Electric field due to a dipole

1. Axial

2. Equatorial

Electric potential due to dipole

Dipole in uniform electric field

1. Torque

2. Potential energy

Electric flux and gauss law

Flux is no. Of electric field lines passing through an area

e :charge on an electron ??

1.6 × 10(-19) C

Epsilon(not): permittivity of free space, value??

8.85 × 10^(-12) C²N^(-1)m^(-2)