Two balls of same mass and carrying equal charge are hung by threads of length `l` from a fixed support, At electrostatic equilibrium.assuming that angles made by each thread is small,the separation, x between the balls is proportional to:

Two balls, each of radius R, equal mass and density are placed in contact, then the force of gravitation between them is proportional to

Two identical tennis balls each having mass 'm' and charge 'q' are suspended from a fixed point by threads of length 'l'. What is the equilibrium separation when each thread makes a small angle 'theta' with the vertical ?

Two path balls carrying eqaul chareges are suspended froom a common point by strings of equal length, the strings are rightly clamped at half the height. The equilibrium separation between the balls, now becomes :

Two small identical balls P and Q, each of mass 0.866 g, carry identical charges and are suspended by two threads of equal length 50 cm each from the same point. At equilibrium, they are separated by a distance of 50 cm. Find the charge on each ball (in nearest integer in nC ).

Two small spheres, each of mass 0.1 gm and carrying same charge 10^(-9) C are suspended by threads of equal length from the same point. If the distance between the centres of the sphere is 3 cm, then find out the angle made by the thread with the vertical. (g=10 m//s^(2)) & tan^(-1) (1/100) =0.6^(º)

Two small balls of mass m each are suspended side by side by two equal threds to length L. If the distance between the upper ends of the threads be a, the angle theta that the threads will make with the vertical due to attraction between the balls is :

Two pitch balls carrying equal charges are suspended from a common point by strings of equal length, the equilibrium separation between them is r. Now the strings are rigidly clamped at half the height. The equilibrium separation between the balls now become

Two small balls, each having charge q, are suspended by two insulating threads of equal length L fron a hook in an elevator. The elevator is freely falling. Calculate the angle etween the two threads and tension in each thread.