Two coils with a common centre in perpendicular planes: field at the centre

1. A.
   $\mu_0$
2. B.
   $\frac{\mu_0}{2}$
3. C.
   $2\mu_0$
4. D.
   $\sqrt{2}\mu_0$

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1. A.
   $\frac{\mu_0 I}{2R}$
2. B.
   $\frac{3\mu_0 I}{2R}$
3. C.
   $\frac{5\mu_0 I}{2R}$
4. D.
   $\frac{7\mu_0 I}{2R}$

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1. A.
   $\frac{\mu_{0}I}{2R}$
2. B.
   $\frac{\mu_{0}I}{R}$
3. C.
   $\frac{3\mu_{0}I}{2R}$
4. D.
   $\frac{\sqrt{5}\mu_{0}I}{2R}$

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