Two long wires with no contact are placed perpendicular to each other. $i_1$ and $i_2$ are currents flowing through these wires respectively. The magnetic force on a small length '$d$' of the second wire situated at a distance '$l$' from the first wire is proportional to,
- A$i_1 i_2$
- B$l$
- C$\frac{1}{i_1 i_2}$
- D$l^2$
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