physics PLEASE HELP
posted by Anonymous .
Two charges are placed on the x axis. One of the charges (q1 = +7.91C) is at x1 = +3.00 cm and the other (q2 = 27.3C) is at x2 = +9.00 cm. Find the net electric field (magnitude and direction given as a plus or minus sign) at (a) x = 0 cm and (b) x = +6.00 cm.

find the E from each, and add. Remember the direction of E fields (the direction a positive test charge will go, which is away from positive charges, and toward negative charges). Sketch the diagram, to make certain you add them correctly (they should be in the same direction inthis problem) for b, and in opposite directions in a.