A point particle of charge q1=4.5*10^-6 is placed on the x-axis at x=-10 cm. A second particle of charge q2 is placed on the x-axis at x=+25 cm. The electric field at the origin is zero. Determine the charge q2

Two point charges are separated by a certain distance. how does the strength of the electric field produced by the first charge, at the position of the second charge, change if the second charge is doubled? a. the field does not change b. the field strength decreases by half. c. the field strength doubles d. the field strength quadruples