Two equal negative charges -q are fixed at points (0,-a) and (0,a) on y-axis. A positive charge Q is released from rest at the point (2a,0) on the x-axis. The charge Q will
Positive and negative point charges of equal magnitude are kept at (0,0,a/2) and (0,0,-a/2), respectively. The work done by the electric field when another positive point charge in moved from (-a,0,0) to (0,a,0) is.
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An electron of mass me , initially at rest, moves through a certain distance in a uniform electric field in time t1 .A proton of mass mp ,also initially at rest, takes time t2 to move through an equal distance in this uniform electric field. Neglecting the effect of gravity, the ratio t1 /t2 is nearly equal to.
Two charges, each equal to q, are kept at x=-a and x=a on the x-axis. A particle of mass m and charge q0=q/2 is placed at the origin. If charge q0 is given a small displacement y(y<<a) along the y-axis, the net force acting on the particle is proportional to
A charge q is placed at the centre of the line joining two equal charges Q. The system of the three charges will be in equilibrium if q is equal to