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Two thin long parallel wires separated by a distance $b$ are carrying a current $i$ $amp$ each. The magnitude of the force per unit length exerted by one wire on the other is
  • A$\frac{{{\mu _0}{i^2}}}{{{b^2}}}$
  • B$\frac{{{\mu _0}{i^2}}}{{2\pi b}}$
  • C$\frac{{{\mu _0}i}}{{2\pi b}}$
  • D$\frac{{{\mu _0}i}}{{2\pi {b^2}}}$
IIT 1986, Medium
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