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Two long straight wires are set parallel to each other. Each carries a current i in the same direction and the separation between them is 2r. The intensity of the magnetic field midway between them is

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$4 μ_{0} i / r$

$μ_{0} i / 4 r$

$μ_{0} i / r$

Zero

answer is C.

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Detailed Solution

At P,

$\begin{array}{l} B_{net} = B_{1} - B_{2} \\ Since |B_{1}| = |B_{2}| \\ So, B_{net} = 0 \end{array}$

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