" Two point charges "+2q" and "-q" are placed on "x" -axis at "(0,0,0)" and "(3,0,0)" respectively,How many points of zero electric potential are there in the plane "X=5?

In the figure, two point charges +q and -q are placed on the x-axis at (+a,0) and (-a,0) respectively. A tiny dipole of dipolem moment (p) is kept at the origin along the y-axis. The torque on the dipole equals

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

Two point charges+q nd -q are held fixed at (-a,0) and (a,0) respectively of a x-y coordinate system then

Two point charges +q and -q are held fixed at (-d,o) and (d,0) respectively of a x-y coordinate system. Then

Point charges +4q, -q are kept on the x -axis at points x=0,x=a and X=2a respectively, then

Three point charge q_1=1muC, q_2=-2muC and q_3=3muC are placed at (1m, 0,0), (0,2m,0) and (0,0,3m) respectively. Find the electric potential at as origin.

Two charges q_(1) and q_(2) are placed at (0,0d) and (0,0-d) respectively. Find locus of points where the potential is zero.