A -3.00 nC point charge is on the x-axis at x = 1.20 m. A second point charge, Q, is on the x-axis at -0.600 m. What must be the sign and magnitude of Q for the resultant electric field at the origin to be (a) 45.0 N/C in the +x-direction, (b) 45.0 N/C in the -x-direction?

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A -3.00 nC point charge is on the x-axis at x = 1.20 m. A second point charge, Q, is on the x-axis at -0.600 m. What must be the sign and magnitude of Q for the resultant electric field at the origin to be (a) 45.0 N/C in the +x-direction, (b) 45.0 N/C in the -x-direction?

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