7)
Note that the charge q also exerts an equal and opposite force on the
charge Q The electrostatic force between the charges Q and q can be
looked upon as an interaction between charge q and the electric field of
Q and vice versa If we denote the position of charge q by the vector r, it
experiences a force F equal to the charge q multiplied by the electric
field E at the location of q Thus,
F(r) = q E(r)
(1