Two charges`+q_(1)` and `-q_(2)` are placed at A and B respectively. A line of force emanates from `q_(1)` at an angle `alpha` with the line AB. At what angle will it terminate at `-q_(2)` ?

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.

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

Three charges -q_(1), +q_(2) and -q_(3) are placed as shown in the figure. The x -component of the force on -q_(1) is proportional to

Two points charge q_(1) and q_(2)(=q_(1)//2) are placed at points A(0,1) and B(1,0) as shown in the figure.The electric field vector at point P(1,1) makes an angle q with the x-axis ,then the angle q is

Two point charges Q and q are placed at distance r and r/2 respectively alogn a straigt line from a third charge 4q. If q is in equilibrium determine Q/q .

Three charges -q_1 , +q_2 and -q_3 are placed as shown in the figure. The x-component of the force on -q_1 is proportional to