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Two identical conducting wires \( \mathrm{AOB} \) and \( \mathrm{COD} \) are placed at right angles to each other. The wire \( \mathrm{AOB} \) carries an electric current \( \mathrm{I}_{1} \) and COD carries a current \( \mathrm{I}_{2} \). The magnetic field on a point lying at a distance ' \( \mathrm{d} \) ' from \( \mathrm{O} \), in a direction perpendicular to the plane of the wires \( \mathrm{AOB} \) and \( \mathrm{COD} \), will be given
\( \mathrm{P} \) by :
(A) \( \frac{\mu_{0}}{2 \pi}\left(\frac{I_{1}+I_{2}}{d}\right)^{1 / 2} \)
(B) \( \frac{\mu_{0}}{2 \pi \mathrm{d}}\left(\mathrm{I}_{1}^{2}+\mathrm{I}_{2}^{2}\right)^{1 / 2} \)
(C) \( \frac{\mu_{0}}{2 \pi d}\left(I_{1}+I_{2}\right) \)
(D) \( \frac{\mu_{0}}{2 \pi d}\left(I_{1}^{2}+\mathrm{I}_{2}^{2}\right) \)
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