9. At points between the charges, the individual electric fields are in the same direction and do not cancel. Since charge q2= − 4.00 q1located at x2= 70 cm has a greater magnitude than q1 = 2.1 ×10−8 C located at x1= 20 cm, a point of zero field must be closer to q1than to q2. It must be to the left of q1. Let xbe the coordinate of P, the point where the field vanishes. Then, the total electric field at Pis given by
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