Two long straight parallel wires, carrying (adjustable) current $I_1$ and $I_2$, are kept at a distance $d$ apart. If the force $'F'$ between the two wires is taken as 'positive' when the wires repel each other and 'negative' when the wires attract each other, the graph showing the dependence of $'F'$, on the product $I_1 I_2$, would be
JEE MAIN 2015, Medium
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$I_1\, I_2\, =$ Positive
(attract) $F\, =$ Negative
$I_1\, I_2\, =$ Negative
(repell) $F\, =$ Positive
Hence, option $(a)$ is the correct answer
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