What must the sign and magnitude of q2 be for the net

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?

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What must the sign and magnitude of q2 be for the net : a negative point charge q1 -4.00nc is on the x-axis at x0.60m . a second point charge q2 is on the x-axis at x -1.20m

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