A steady current I is flowing in the –x direction through each of two infinitely long wires at \(y = \pm \frac{L}{2}\) as shown in the figure. The permeability of the medium is \({\mu _0}\). The \(\vec B\) – field at (0, L, 0) is

\(+ \frac{{4{\mu _0}I}}{{3\pi L}}\hat z\)

\(- \frac{{4{\mu _0}I}}{{3\pi L}}\hat z\)

\(- \frac{{3{\mu _0}I}}{{4\pi L}}\hat z\)

A steady current I is flowing in the –x direction through each of tw

1.	A steady current I is flowing in the –x direction through each of two infinitely long wires at \(y = \pm \frac{L}{2}\) as shown in the figure. The permeability of the medium is \({\mu _0}\). The \(\vec B\) – field at (0, L, 0) is
A.	\(- \frac{{4{\mu _0}I}}{{3\pi L}}\hat z\)
B.	\(+ \frac{{4{\mu _0}I}}{{3\pi L}}\hat z\)
C.	0
D.	\(- \frac{{3{\mu _0}I}}{{4\pi L}}\hat z\)
Answer» B. \(+ \frac{{4{\mu _0}I}}{{3\pi L}}\hat z\)

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A steady current I is flowing in the –x direction through each of two infinitely long wires at \(y = \pm \frac{L}{2}\) as shown in the figure. The permeability of the medium is \({\mu _0}\). The \(\vec B\) – field at (0, L, 0) is

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