Field on the axis of a circular coil

1. A.
   1:3
2. B.
   1:8
3. C.
   8:1
4. D.
   27:1

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1. A.
   $\frac{\mu_{0}nI}{9r}$
2. B.
   $\frac{\mu_{0}nI}{18r}$
3. C.
   $\frac{\mu_{0}nI}{54r}$
4. D.
   $\frac{\mu_{0}nI}{27r}$

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1. A.
   $1 : \sqrt{2}$
2. B.
   $1 : 3\sqrt{2}$
3. C.
   $\sqrt{8} : 1$
4. D.
   $3\sqrt{2} : 1$

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1. A.
   $B_y = B_x$
2. B.
   $B_y = 2B_x$
3. C.
   $B_x = 2B_y$
4. D.
   $B_x = 4B_y$

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1. A.
   $3R$
2. B.
   $\sqrt{3}\,R$
3. C.
   $\dfrac{R}{2\sqrt{3}}$
4. D.
   $\dfrac{2R}{\sqrt{3}}$

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1. A.
   $\dfrac{\mu_0nA}{4\pi ir^3}$
2. B.
   $\dfrac{2\mu_0niA}{4\pi r^3}$
3. C.
   $\dfrac{2\mu_0ni}{4\pi Ar^3}$
4. D.
   $\dfrac{\mu_0niA}{4\pi r^3}$

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1. A.
   $\mu_0 I$
2. B.
   $\dfrac{\mu_0 I}{4}$
3. C.
   $\dfrac{\mu_0 I}{2}$
4. D.
   $\dfrac{\mu_0 I}{6}$

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