A charged particle \( X \) moves directly toward another charged particle \( Y \). For the \( X ...

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A charged particle \( X \) moves directly toward another charged particle \( Y \). For the \( X \) and \( Y \) system, the total momentum is \( p \) and the total energy is \( E \).
(1) If \( Y \) is fixed, \( E \) is conserved but not \( p \).
(2) If \( Y \) is fixed, neither \( E \) nor \( p \) is conserved.
(3) \( p \) and \( E \) are conserved if both \( X \) and \( Y \) are free to move.
(4) (a) is true only if \( X \) and \( Y \) have similar charges.
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