Three equal charges +Q each are placed on the vertices of an equilateral triangle. A charge +q is initially placed at the centre of the triangle. If this charge (+q) is slightly displaced towards a vertex and left free.
What will be its motion?
Initially its in equilibrium and when its displaced to one end, charges far from it will exert lesser repulsive force and the vertex charge will exert more force since it went closer to it. Hence it goes back to its original position and does SHM.
Am I correct?