Definitions of electrical topics

1. Gandhinagar Institute
of Technology(012)
Subject : EEE(2110005)
Active Learning Assignment
Branch : Computer
DIV. : A-2
Prepared by : - Vishvesh jasani (160120107042)
Guided By: Prof. Nirav Pandya
topic:Definitons-Electric Field,Lines of Force,Electric Intensity

2. Brief flow of presentation
1. Introduction
2. Electric field
3. lines of force
4. electric field intensity

3. Electric field
- An electric field is a vector field that associates to
each point in space the Coulomb force that would
be experienced per unit of electric charge by an
infinitesimal test charge at that point.
- Electric fields converge and diverge at electric
charges and can be induced by time-varying
magnetic fields.
-The electric field combines with the magnetic field to
form the electromagnetic field.

4. Definition - Electric Field
The electric field, E, at a given point is defined as the (vectorial) force F,
that would be exerted on a stationary test particle of unit charge by
electromagnetic forces (i.e. the Lorentz force)
A particle of charge q would be subject to a force F = q ⋅ E
The force on an object of charge q in an electric field E is given
by:
F = qE
Therefore, if we know the mass and charge of a particle, we can
describe its subsequent motion in an electric field.

5. The electric field is defined as the force on a small charge, divided
by the magnitude of the charge:
The Electric Field

6. Force on a point
charge in an electric
field:
The Electric Field

7. Lines of force
-A line of force in Faraday's extended sense is synonymous with
Maxwell's line of induction.
-Lines of force are lines in any such force field the tangent of which at
any point gives the field direction at that point and the density of
which gives the magnitude of the field.
-The electric lines of force that represent the field of a positive electric
charge in space consist of a family of straight lines radiating
uniformly in all directions from the charge where they originate.

8. -A second positive charge placed in the field would travel radially
away from the first charge.
-In the case of a magnetic field, since no isolated unit pole has ever
been discovered.
-the field lines are called lines of force only in the sense that a small
magnet is forced to align itself in the direction of these field lines.
-An electric charge traveling along a magnetic field line undergoes
no magnetic force.

9. Electric field intensity
-Electric field intensity is the strength of an electric field at any
point.
-It is equal to the electric force per unit charge experienced by a test
charge placed at that point.
-The unit of measurement is volts per meter or newtons per
coulomb.
- This physical quantity has dimensions MLT−3A−1. It is a vector
quantity, and its direction is along the direction of force.

10. The electric field at a point P due to a charge q is the
force acting on a test charge q0 at that point P,
divided by the charge q0 :
ELECTRIC FIELD INTENSITY DUE TO
POINT CHARGE
For a point charge q
0
0
( )
qq
q
F
E p
q

r
r
ˆ( )
4 ^ 2
q
q
E p r
r


r

11. The magnitude of electric field intensity at any point in
electric field is given by force that would be experienced
by a unit positive charge placed at that point.
THE MAGNITUDE OF ELECTRIC FIELD
INTENSITY
UNIT: N/C OR V/M
F
E
Q

r
r