Question

obtain an expression for the intensity of an electric field at a point due to point charge

Answer 1

Consider a point charge q called SOURCE CHARGE placed at a point ‘O’ in space. To find its intensity at a point ‘p’ at a distance ‘r’ from the point charge we place a test charge 'q'.

The force experienced by the test charge q’ will be:
F = Eq’----(1)

According to coulomb's law the electrostatic force between them is given by:


Putting the value of 'F' we get : www.citycollegiate.com