Through two parallel wires $A$ and $B$,$10 \, A$ and $2 \, A$ of currents are passed respectively in opposite directions. If the wire $A$ is infinitely long and the length of the wire $B$ is $2 \, m$,the force on the conductor $B$,which is situated at a $10 \, cm$ distance from $A$,will be:
- A$8 \times 10^{-5} \, N$
- B$4 \times 10^{-7} \, N$
- C$4 \times 10^{-5} \, N$
- D$4\pi \times 10^{-7} \, N$
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