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Two point charges, Q 1 = -2.0 μ C and Q 2 = +2.0 μ C, are placed as shown. In Fig. 21.2b, the x-component of the electric field, at the origin O, is closest to: 1400 N/C 2300 N/C -11,000 N/C 11,000 N/C -7800 N/C
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