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Electrostatic (Electric field (vector quantity
force per unit charge, E=…
Electrostatic
Electric field
- vector quantity
- force per unit charge
E= F/q = kQ/r2
- E is the electric field
- k is the coulomb's constant
- q is charge
r is the distance
Electric field lines 
Electric field from uniform distribution of charge
- the charge per unit volume ( ρ )
q = ρ x v
- the charge per unit area ( σ )
q=σ x A
- the charge per unit length ( λ )
q= λ x l
Moving charge in a Uniform Electric field
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Electric potential
The amount of work needed to move a unit of charge from a reference point to a specific point inside the field without producing an acceleration
Work, electric potential energy and electric potential
Relationship between the electric field and the potential difference
Coulomb's law
A force proportional to the product of the charges and inversely proportional to the square of the distance between them
where
- F is the force
- k is the coulomb's law constant ( 8.99x109 (Nm2/C2) )
- q1 and q2 is the signed magnitudes of the charges
- r is the distance
Equipotential surface
- The electric potential at any point on the surface
- The electric field is everywhere perpendicular to the equipotential surface
- The potential on the equipotential surface is everywhere constant
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Charging and discharging
Process of charging a conducting sphere by contact and by induction