(2)Three charges +q +Q and -Q are placed at the corners of an equilateral triang

(2)Three charges +q +Q and -Q are placed at the corners of an equilateral triangle as shown in Figure. The net force on charge +q due to the other two charges is
(a) Vertically up.
(b) Vertically down.
(c) Zero.
(d) Horizontal to the left.
(e) Horizontal to the right.
(3)A positive charge that is free to move but is at rest in an electric field will (a) Accelerate in the direction perpendicular to (b) Remain at rest. (c) Accelerate in the direction opposite to (d)Accelerate in the same direction as (e) Do none of the above.(4)If four charges are placed at the corners of a square as shown in Figure the field is zero at (a) All points along the sides of the square midway between two charges. (b) The midpoint of the square. (c) Midway between the top two charges and midway between the bottom two charges. (d) None of the above.(5)At a particular point in space a charge Q experiences no net force. It follows that (a) There are no charges nearby. (b) If charges are nearby they have the opposite sign of Q. (c) If charges are nearby the total positive charge must equal the total negative charge. (d) None of the above need betrue.