Field midway between two parallel wires with equal currents in the same direction

1. A.
   $\frac{2\mu_0 I}{r}$
2. B.
   zero
3. C.
   $\frac{\mu_0 I}{4r}$
4. D.
   $\frac{\mu_0 I}{2r}$

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1. A.
   $0.05\mu_0\ \mathrm{Wb/m^2}$
2. B.
   $(0.05/8)\mu_0\ \mathrm{Wb/m^2}$
3. C.
   $(0.05/4)\mu_0\ \mathrm{Wb/m^2}$
4. D.
   zero.

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