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Two long straight wires are placed along $x$-axis and $y$-axis. They carry current $I_1$ and $I_2$ respectively. The equation of locus of zero magnetic induction in the magnetic field produced by them is
  • A$y=x$
  • B$y=\left(\frac{I_2}{I_1}\right) x$
  • C$y=\left(\frac{I_1}{I_2}\right) x$
  • D$y=\left(I_1 I_2\right) x$
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