(D) decreases and continues in the same direction.
(E) decreases and changes direction.3 . An electron of charge –e and mass m is launched with a velocity of v 0 through a small hole in the
right plate of a parallel plate capacitor toward the opposite plate a distance of d away. The electric
potential of both plates are equal in magnitude but opposite in sign ±V , as shown in the figure. The
velocity of the electron as it reaches the left plate is(A) (B)
(C)
(D)
(E)
4 . Two metal spheres with different radii but the same charge (+Q) are separated by a distance of d ,
which is much greater than their combined radii. The two spheres exert a force of F on each other.
They are brought into contact and then again placed a distance of d apart. The new force between the
spheres is
(A)