Question

Two identical charges of 2mmC are placed at points B(8cm,-2cm) and C(2cm,-2cm) respectively. Calculate the value of charge 'q' to be placed at a point A(a cm, 2cm) which is equidistant from the points B and C such that the electrostatics potential energy of a system is zero.​

Answer 1

Question .

Two charges of magnitude 5nC and −2nC, one placed at points (2cm,0,0) and (xcm,0,0) in a region of space, where there is no other external field. If the electrostatic potential energy of the system is −0.5μJ. The value of x

answer

Potential energy of system

U=4πε01rq1q2

0.5×10−6=(x−2)×10−29×109×5×10−9×(−2)×10−9⇒x=20cm

⇒ x=20cm