Two long straight parallel wires, carrying (adjustable) currents $I_2$ 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 :

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