One positive charges and one negative charge, both of the same magnitude, are near each other. If we double the amount of charge on both of them while simultaneously doubling the distance between them,
(a) the strength of the electrical force on both increases to twice its original magnitude.
(b) the strength of the electrical force on both increases to four times its original magnitude.
(c) the strength of the electrical force on both decreases to half its original magnitude.
(d) the strength of the electrical force on both decreases to one-fourth its original magnitude.
(e) the strength of the electrical force on both does not change.