Download SI unit is given by coulomb(C).

Electrical
charge
Charge of material body that possession due to which it
strongly interacts with other material body. It can be
Positive(+ve) or Negative(-ve).
S.I unit is given by coulomb(C).
Electrical charges
Coulomb’s
Law
The magnitude of the electrostatic force of interaction
between two point charges is directly proportional to the
scalar multiplication of the magnitudes of charges and
inversely proportional to the square of the distance between
them.
Scalar form(for problem solving)
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Electric
Field
The physical field where a charged particle, irrespective of fact whether it is in
motion or at rest , experience force is called
Electric Field (E)
or
Unit of E newtons per coulomb or
Vector form
Electric Field Due to Infinite Line of charge
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Electric Field Due to ring
E is maximum when
= 0 , so we get x =
√
Ecentre = 0
Electric Field due to infinite charged conductor
Electric Field due to solid Spheres
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Electric Field due to spherical shell
Electric Field due to uniformly charged cylinder
Electric Field due to cylindrical shell
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Electric Lines The Line of force In an electric Field is a hypothetical line tangent to which at
any point on it represents the direction of electric field at the given point.
Of Force(ELF)
Electrostatics
equilibrium
# Position where net force ( or net torque ) on a charge is ZERO
Stable Equilibrium: if charged is displayed by a small distance
the charge comes (or tries to come) back to equilibrium.
Unstable Equilibrium: if charged is displayed by a small
distance the charge does not return to equilibrium position.
Electric
Potential
Work done by external agent to bring a unit positive charge
(without acceleration) from infinity to a point in an electric
field is called electric potential at that point.
Va = potential at a
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vb = potential at b
r = distance
Relation between electric field and electric potential
Potential due to point charge
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Potential due to solid Spheres
Potential due to Spherical shell
EQUIPotential
Surface and
EQUIPotential
Region
Potential
energy
Of charges
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In an electric field the locus of points of equal potential is
called an equipotential surface.
#An equipotential surface and electric field meets at right
angle
The region where E = 0 , is termed as Equipotential region
#The region, for system of n charged particle there will be
Note:
U = qV
For solving equation use:
Electric Dipole
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U = q1V = q2V
work done in rotation of dipole
Electric flux is the measure of flow of the electric field through a given
area. Electric flux is proportional to the number of electric field lines
going through a normally perpendicular surface.
Electric Flux
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Gauss’s law
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