Equal currents are passing through two very long and straight parallel wires in the same direction. They will,

Two long parallel wires carrying equal current separated by $1 \mathrm{m}$ exert a force of $2\times {10}^{-7} \mathrm{N} {\mathrm{m}}^{-1}$ on one another. The current flowing through them is,

$A$, $B$ and $C$ are parallel conductors of equal length carrying currents $I$, $I$ and $2I$, respectively. Distance between $A$ and $B$ is $x$. Distance between $B$ and $C$ is also $x$. $F_1$ is the force exerted by $B$ on $A$ and $F_2$ is the force exerted by $B$ on $A$. Choose the correct answer.

Three long straight and parallel wires carrying currents are arranged as shown in the figure. The force experienced by $10 \mathrm{cm}$ length of wire $Q$ is,

Two long parallel wires separated by $0.1 \mathrm{m}$ carry currents of $1 \mathrm{A}$ and $2 \mathrm{A}$, respectively in opposite directions. A third current-carrying wire parallel to both of them is placed in the same plane such that it feels no net magnetic force. It is placed at a distance of,