ElectrostaticsHard

Question

Two particles X and T, of equal mass and with unequal positive charges, are free to move and are initially far away from each other. With T at rest, X begins to move towards it with initial velocity u. After a long time, finally :

Options

A.X will stop, Y will move with velocity u
B.X and Y will both move with velocities u/2 each
C.X will dtop, Y will move with velocity < u
D.both will move with velocities < u/2

Solution

Equal electrostatic force (mutual interaction) acts on X and Y but in opposite direction which accelerate Y but retards X. After long time the velocity of X becomes zero while Y becomes u.

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