Asked by arvind95 | 11th Sep, 2012, 06:20: AM

Expert Answer:

Suppose one charge is Q& other q.
Then Q will apply kqQ/(r.r) force on q  say in west direction and q will apply kqQ/(r.r) force on Q in east diretion.
So they both will move as an effect of forces acting on them.
These are the forces on individual particles which are inside the internal fporce.
so net internal force is 0 in the system.
There is no external force acting.

Answered by  | 12th Sep, 2012, 11:11: AM

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