An electric field of 460,000 N/C points due west at a certain spot. What is the magnitude of the force that acts on a charge of -3.00 \mu C at this spot? (1\mu C = 10-6 C) Give your answer in Sl unit rounded to two decimal places. (do not enter units) Three point charges are placed on the x-axis. A charge of +4.50 \mu C is placed at the origin, -5.00 \mu C to the right at x = 50.0 cm, and +7.50 \mu C at the x= 100.0 cm. What is the magnitude of the electrostatic force (in Newtons) which acts on the charge at x = 50.0 cm? k = 9.00 x 109 N-m2-C-2