(a) State Coulomb’s law for two stationary point charges in vacuum in scalar form and clearly explain the meaning of each symbol used.
(b) Describe how the algebraic signs of the interacting charges decide whether the force is attractive or repulsive. Support your answer with suitable reasoning.
(c) Two point charges of +4\,µC and \,-6\,µC are fixed at a separation of 8\,cm in air. Without performing any numerical calculation, state
(i) whether the force on each charge is attractive or repulsive, and
(ii) whether the magnitudes of the forces on the two charges are equal or unequal. Give reasons for both answers.
c. (c) Two point charges of +4μC and −6μC are fixed at a separation of 8cm in air. Without performing any numerical calculation, state
(i) whether the force on each charge is attractive or repulsive, and
(ii) whether the magnitudes of the forces on the two charges are equal or unequal. Give reasons for both answers.