Two long straight wires are set parallel to each other. Each carrie...

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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 \( 2 r \). The intensity of the magnetic field midway between them is
(a) \( \mu_{0} i / r \)
(b) \( 4 \mu_{0} i / r \)
(c) zero
(d) \( \mu_{0} i / 4 r \)
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