THEORY OF ELECTRIC FIELDS
- Electric Field concept and Intensity
Electric field of a charge is the space around it in which any other charge experiences an electrostatic force.
Electric field intensity: The electric field intensity at a point due to a source charge may be defined as the electrostatic force per unit positive charge acting on a vanishingly small positive test charge placed at that point. It is a vector quantity.
- Electric Field due to a Circular Loop of Charge
A circular loop of charge behaves as a point charge at very large distances as compared to the radius of the loop.
- Electric Field due to an Electric Dipole on its Axial and Equatorial Line
The direction of electric field at any point on the axial line is the same as that of electric dipole moment vector.
The direction of electric field at an equatorial point is opposite to that of electric dipole moment vector.
Properties of Electric Lines of Force:
1) The electric lines of force start from a +ve charge and ends at a –ve charge.
2) The lines of force always originate or terminate at right angles to the surface of the charged body.
3) The lines of force do not pass through the body of the conductor.
4) Two lines of force do not intersect each other at a point.
5) The relative closeness of the lines of force at a given region gives an idea about the relative strength of the electric field in that region.
6) The lines of force contract longitudinally, which accounts for the force of attraction between opposite charges.
7) The lines of force exert lateral pressure on one another, which accounts for the force of repulsion between like charges.
- Torque on an Electric Dipole placed in Uniform Electric Field
- Gauss’s Theorem and its applications
- Electric Field due to Line Charge, Plane Sheet of Charge, Two parallel Plane Sheets of Charge, Charged Spherical Shell and Solid Sphere of Charge
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