Posted by Cassie on Thursday, January 13, 2011 at 10:30pm.
The direction will be opposite (-y) because the sign of the charge is reversed (positive to negative).
The magitude of the force will be (2.7/5.0) times 0.48 N. It is proportional to the charge.
The local electric field where the chrges are located is assumed to stay the same.
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