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Through two parallel wires $A$ and $B$, $10$ and $2$ $ampere$ of currents are passed respectively in opposite direction. 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 $10\, cm$ 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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