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Two very long, straight and insulated wires are kept at $90^o$ angle from each other In $xy -$ plane as shown in the figure. These wires carry current of equal magnitude $I$, whose directions are shown in the figure. The net magnetic field at point $P$ will be
  • A$\frac{{{\mu _0}I}}{{2\pi d}}\left( {\hat x + \hat y} \right)$
  • B$\frac{{ + {\mu _0}I}}{{\pi d}}\left( {\hat z} \right)$
  • C
    Zero
  • D$-\frac{{{\mu _0}I}}{{2\pi d}}\left( {\hat x + \hat y} \right)$
JEE MAIN 2019, Medium
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