Electrostatics

Front 1

Continuous charge distribution

Back 1

A system of closely spaced charges

Hint 1

System

Front 2

Point charge

Back 2

Any charge whose dimensions are much less than its distance from the obs point

Front 3

1 Coulomb

Back 3

Quantity of charge which when placed at a distance of 1m from an equal charge experiences a force of 9× 10^9 N

Front 4

Superposition principle

Back 4

Consider a system of n stationary charges , individual forces are unaffected due to presence of other charges

Front 5

What is

Back 5

Permittivity of vacuum/free space

Front 6

What is the value of k in F=kqq/r^2

Back 6

9×10^9 Nm2/C2

Front 7

What is the value of permittivity of free space (Eo)?

Back 7

8.854× 10^-12

Front 8

Three charge distributions

Back 8

•line charge distribution

•surface charge distribution

•volume charge distribution

Front 9

What is line charge distribution

Back 9

When charge is uniformly distributed along a line/edge/circumference, the system is said to be a line charge distribution

Front 10

Surface charge distribution

Back 10

When charge is uniformly distributed over a surface,the system....

Front 11

Volume charge distribution

Back 11

When------- distributed (not necessarily uniform in all cases) throughout a volume

Front 12

Line charge density is given by

Back 12

Front 13

Surface charge density

Back 13

Sigma

Front 14

Electric field, definition, SI unit, features: min 3

Back 14

The region surrounding a charge in which it's influence can be experienced by other charges.

Field due to charge Q at a point P, is the Force a unit positive test charge would experience at THAT point.

SI unit; N/C

Source charge(the one producing teh EF)

Test charge; which tests the effect of src charge

Q must remain at its original location and naturally, test charge<<< src charge

EF of positive -radially outward

Of negative

Electric field at points equidistant from src charge is same

Front 15

ELECTRIC FIELD INTENSITY

Back 15

at any point is the strength of the EF at that point. E=F/q

Force experienced by a unit positive charge placed at that point

Front 16

Formula of torque

Back 16

Where theta is the angle that dipole moment makes with the direction of EF

Front 17

T max

Back 17

T max= PE (i.e. when theta is 90°)

Front 18

Definition of electric dipole (both numeric awa conventional)

Back 18

We know, T max= PE (i.e when DM is perp. to EF)

=> P= Tmax/E

Put E= 1 Newton per coulomb

=> P= T

Electric dipole moment is numerically equal to the torque experienced by the electric dipole when placed perp to an electric field of EFI(electric field intensity) of 1N/C.

Front 19

Gauss's law gives the relation between

Back 19

Total flux passing through any closed surface and net charge enclosed within the surface.

Front 20

Gauss's theorem statement

Back 20

The total flux through closed surface is 1/E0 times the charge enclosed by that surface

Front 21

Electric flux

Back 21

What is it

Definition

Denoted by

Formula

Whether scalar or vector

SI unit

Front 22

Electric flux through a given area

Back 22

Held inside an EF is the measure of total number of EFL passing normally through that area.

Front 23

Electric flux is a

Back 23

Scalar quantity

Front 24

Electric flux through any surface

Back 24

Is equal to the surface integral to electric field E (vector) taken over the surface S.