Two point charges of magnitude +q and -q are placed at (-d/2, 0, 0) and (d/2, 0, 0) respectively. Find the equation of the equipotential surface where the potential is zero.

Two charges of magnitude 5 nC and -2 nC are placed at points (2 cm, 0, 0) and (20 cm, 0, 0) in a region of space, where there is no other external field. Find the electrostatic potential energy of the system.

Co-ordinates of points P and Q are (-2,0) and (2,0) respectively .Find d(P,Q) .

Two charge of magnitudes - 4Q and + 2Q are located at points (2a, 0) and (5a, 0) respectively. What is the electric flux due to these charges through a sphere of radius 4a with its centre at the origin?

Two charges of magnitude -2Q and +Q are located at points (a,0) and (4a,0) respectively . What is the electric flux due to these charges through a sphere of radius '3a' with its centre at the origin?

If A(2,0) and B(0,3) are two points,find the equation of the locus of point P such thatt AP=2BP .

If the co-ordinates of points A andB are (-5,0) and (2,0) respectively, then find d (A,B)

Two point charges of magnitudes +100muC and -400muC are kept 30 cm apart. Find the point of zero potential on the line joining the two charges.