Let us consider an infinitesimal element of length dx at a distance x from the point P.
The charge on this element is dq = λdx,
where, is the linear charge density.
The magnitude of the electric field at P due to this element is
and its direction is to the right since X is positive.
The total electric field strength E is given by
Given,
Distance between the charges, r =
a) Since,
b)As,
Two identical charged bodies have 12 μC and – 18 μC charge respectively. These bodies experience a force of 48 N at certain separation. The bodies are touched and placed at the same separation again. Find the new force between the bodies.