Two charges q and)3q are placed on the x-axis separated by a distance d. Where should a third charge 2q be placed so that it doesn't experience any force?
a) At d/2 to the right of q
b) At d/2 to the left of)3q
c) At 2d/3 to the right of q
d) At 2d/3 to the left of)3q