A charged particle X moves directly towa...

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. ,

p and E are conserved if both X and Y are free to move

(a) is true only if X and Y have similar charges

If Y is fixed, E is conserved but not p

If Y is fixed, neither E nor p is conserved

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