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Two identical conducting wires $AOB$ and $COD$ are placed at right angles to each other. The wire $AOB$ carries an electric current  $I_1$ and $COD$ carries a current $I_2$ . The magnetic field on a point lying at a distance $d$ from $O$, in a direction perpendicular to the plane of the wires $AOB$ and $COD$, will be given by
  • A$\frac{{{\mu _0}}}{{2\pi d}}$ $(I_1^2 +I_2^2)$
  • B$\;\frac{{{\mu _0}}}{{2\pi }}{\left( {\frac{{I_1 + I_2}}{d}} \right)^{\frac{1}{2}}}$
  • C$\;\frac{{{\mu _0}}}{{2\pi d}} {\left( {{{I}}{_1^2}{{\;}} + {{I}}{_2^2}} \right)^{\frac{1}{2}}}$
  • D$\;\frac{{{\mu _0}}}{{2\pi d}}$ $(I_1+I_2)$
AIEEE 2007,AIPMT 2014, Diffcult
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