Field on the axis of a circular coil compared with the field at its centre

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

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

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