A negative point charge q1= -4.00nC is on the x-axis at x=0.60m . A second point charge q2 is on the x-axis at x= -1.20m .
Part a: What must the sign and magnitude of q2 be for the net electric field at the origin to be 50.0 N/C in the +x-direction?
Part b: What must the sign and magnitude of q2 be for the net electric field at the origin to be 50.0 N/C in the -x-direction?