, the large size of the unit of charge
(1C) from the point of view of electric effects arises because (as
mentioned in point 3 already) the unit of charge is defined in terms of
magnetic forces (forces on  current–carrying wires) which are generally
much weaker than the electric forces Thus while 1 ampere is a unit
of reasonable size for magnetic effects, 1 C = 1 A s, is too big a unit for
electric effects 5 The additive property of charge is not an ‘obvious’ property