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
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(c)
On a general point $A$ magnetic field will be zero when $\frac{\mu_0 I_2}{2 \pi x}=\frac{\mu_0 l_1}{2 \pi y}$
$y=\frac{I_1}{I_2} x$
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