A charged particle X moves directly towards another charged particle Y. For the 'X plus Y system, the total momentum is p and the total energy is E.
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(a, c)
If the system is isolated (no external forces), p and E are conserved. Electrostatics forces are internal forces. To fix Y, external forces must act on the system, viz., on Y. In that case, p is not conserved. However, these external forces do no work, as there is no displacement of Y. E is conserved.
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