$A$ and $B$ are two conductors carrying a current $i$ in the same direction. $x$ and $y$ are two electron beams moving in the same direction
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The force between two parallel current carrying conductors is given as,
$F=\frac{\mu}{4 \pi} \times \frac{2 I _1 L _2 \times 1}{a}$
Since, the current carrying conductors will attract each other, while electron beams will repel each other.Thus, the force is attraction between $A$ and $B$, is repulsion between $x$ and $y$.
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