Three point charges are arranged along the x axis. Charge q1= -4.70 nC is located at x= 0.200 m and charge q2 = 2.20 nC is at x = -0.340 m. A positive point charge q3 is located at the origin. A) What must the value of q3 be for the net force on this point to have magnitude 4.60 uN? B) Where along the x axis can q3 be placed and the net force on it be zero, other than the trivial answers of x = + infinity and x = - infinity?