Three point charges q,`-2q and 2q` are place on x-axis at a distance `x=0, x=3/4R` and `x=R` respectively from origin as shown. If `q=2 times 10^(-6) C` and `R=2`cm , the magnitude of net force experienced by the charge`-2q` is ____N.

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

Charges 4Q, q and Q and placed along x-axis at positions x=0,x=t//2 and x=1 , respectively. Find the value of q so that force on charge Q is zero

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 .

" 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?

(a) Three point charges q,-4q and 2q are placed at the vertices of an equilateral triangle ABC of side 'l' as shown in the figure. Obtain the expression for the magnitude of the resultant electric force acting on the charge q. (b) Find out the amount of the work 4one to separate the charges at infinite distance.

A two point charges 4q and -q are fixed on the x - axis x=-d/2 and x = d/2 , respectively. If a third point charge 'q' is taken from the origin to x = d along the semicircle as shown in the figure, the energy of the charge will