Question

The electric potentials at points P1 and P2 are V1 and V2 respectively. A point electric charge - q is brought from P1 to P2 by an external agent . What is the work done on the charge​

Answer 1

Answer:

Point charges, such as electrons, are among the fundamental building blocks of matter. Furthermore, spherical charge distributions (like on a metal sphere) create external electric fields exactly like a point charge. The electric potential due to a point charge is, thus, a case we need to consider. Using calculus to find the work needed to move a test charge q from a large distance away to a distance of r from a point charge Q, and noting the connection between work and potential (W = −qΔV), it can be shown that the electric potential V of a point charge is

V

=

k

Q

r

V=kQr (Point Charge), where k is a constant equal to 9.0 × 109 N · m2/C2.