Six particles each of mass 'm' are placed at six verties A,B,C,D,Eand F of a regular hexagon of side 'a'. A seventh particle of mass 'M' is kept at center 'O' of the hexagon.
(a)Find net force on 'M'.
(b)Find net force on 'M' if particles at A is removed.
(c) Find net force on 'M' if particles at A and C are removed .