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A coaxial cable having radii $a, b$ and $c$ carries equal and opposite currents of magnitude $i$ the inner and outer conductors. What is the magnitude of the magnetic induction at point $P$ outside of the cable at a distance $r$ from the axis?
  • A$0$
  • B$\frac{{{\mu _0}ir}}{{2\pi {a^2}}}$
  • C$\frac{{{\mu _0}i}}{{2\pi r}}$
  • D$\frac{{{\mu _0}i}}{{2\pi r}}\,\,\frac{{{c^2} - {r^2}}}{{{c^2} - {b^2}}}$
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