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1) A charge is placed at x = 0 meters and another charge of 8 micro-coulombs is placed at x = +4.2 m (both on the x axis). The total electric field produced by these two charges is zero at x = +2.3 meters. Then the charge at x = 0 m, switches sign but its magnitude is not changed. Where on the x axis (x = ____ m), is the total electric field equal to zero now? Answer in meters.

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