Two long straight wires, each carrying a current $I$ in opposite direction are seperated by a distance $R$ . The magnetic induction at a point midway between the wire is
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$B=\frac{\mu_{0} I}{2 \pi(R / 2)}+\frac{\mu_{0} I}{2 \pi(R / 2)} \otimes$
$\mathrm{B}=\frac{2 \mu_{0} I}{\pi R} \otimes$
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