Two straight long conductors $AOB$ and $COD$ are perpendicular to each other and carry currents ${i_1}$ and ${i_2}$. The magnitude of the magnetic induction at a point $ P$ at a distance a from the point $O$ in a direction perpendicular to the plane $ACBD$ is
  • A$\frac{{{\mu _0}}}{{2\pi a}}({i_1} + {i_2})$
  • B$\frac{{{\mu _0}}}{{2\pi a}}({i_1} - {i_2})$
  • C$ \frac{{{\mu _0}}}{{2\pi a}}{(i_1^2 +i_2^2)^{1/2}} $
  • D$ \frac{{{\mu _0}}}{{2\pi a}}\frac{{{i_1}{I_2}}}{{({i_1} + {I_2})}} $
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