Question

02) Two similar charge of +0, as shown in figure are placed at A and B. - charge is placed at point
midway between A and B. - charge will oscillate if
a. It is moved towards A
b. It is moved towards B.
c. It is moved upwards AB
d. Distance between A and B is reduced.
My question is why the 4th one is wrong​

Answer 1

Answer:

becouse same charge at a same distance to the opposit charge...so point a Q charge attrect same force like point B +Q charge