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Three long current carrying wires $P, Q$ and $R$ placed perpendicular to plane of the paper. Magnetic force per unit length on wire $'R'$ is
  • A$\frac{44}{3}\times10^{-7}\, N/m$
  • B$14.6\times10^{-6}\, N/m$
  • C$7.3\times10^{-7}\, N/m$
  • D$7.3\times10^{-6}\, N/m$
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