an isolated point charge is placed somewhere on the x-axis. at the point x = 5.00 cm and y = 0, the electric field points in the positive x direction and has a magnitude E = 10.0 N/C. At the point x = 10.0 cm and y = 0, the electric field points in the positive x direction and has a magnitude E = 15.0 N/C.

a) What is the sign of the charge, how do you know?

b) Where is the charge located? Give the x coordinate in centimetres

c) What is the magnitude of the charge?