Two negative charges of a unit magnitude and a positive charge q are placed along a straight line. At what position and value of q will the system be in equilibrium? (Negative charges are fixed).

Two electrons and a positive charge q are hold along a straight line. At what position and for what value of q will the system be in equilibrium.

Two positive point charges Q and one negative point charge q are arranged in a straight line in such a manner that the complete system remains in equilibrium. What can be the magnituude of Q/q ?

Two equal negative charges are fixed at points and on y-axis. A positive charge Q is released from rest at the point on the x-axis. The charge Q will:

If a charge q is placed at the centre of the line joining two equal charges Q such that the system is in equilibrium then the value of q is

A negative point charge -2q and a positive charge q are fixed ar a distance l apart. Where should a postive test charge Q be placed on the line connecting the charge for it to be in equlibrium ? What is the nature of the equilibrium with respect to longitudinal motions ?

Three positive charges of equal magnitude q are placed at the vertics of and equilatral triangle of side l. How can the system of charges be palced in equilibrium?

What are positive and negative charges?how are these produced?

Two free charges q and 4q are placed at a distance d apart A third charge Q is placed between them at a distance x from charge q such that the system is in equilibrium. Then

Two stationary particles each of +q are placed at a distacne apart. Now a negatively charged particle is placed in a straight line joining two charge. The direction of motion of the negatively charged particle will depend on

(a) Derive and expression for the electric field at any point on the equatorial line of an electric dipole. (b) Two identical point charges, q each kept 2m apart in air. A third point charge Q of unknown magnitude and sign is placed on the line joining the charges such that the system remains in equilibrium. Find the position and nature of Q.