ch22_p9 - 9. At points between the charges, the individual...

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9. At points between the charges, the individual electric fields are in the same direction and do not cancel. Since charge q 2 = 4.00 q 1 located at x 2 = 70 cm has a greater magnitude than q 1 = 2.1 × 10 8 C located at x 1 = 20 cm, a point of zero field must be closer to q 1 than to q 2 . It must be to the left of q 1 . Let x be the coordinate of P , the point where the field vanishes. Then, the total electric field at P is given by
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