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

1. A.
   $0.15\text{ }m$
2. B.
   $0.2\text{ }m$
3. C.
   $0.1\text{ }m$
4. D.
   $1.0\text{ }m$

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1. A.
   $\frac{3}{2}\frac{a^{2}}{r^{2}}$
2. B.
   $\frac{2}{3}\frac{a^{2}}{r^{2}}$
3. C.
   $\frac{2}{3}\frac{r^{2}}{a^{2}}$
4. D.
   $\frac{3}{2}\frac{r^{2}}{a^{2}}$

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1. A.
   $B/2$
2. B.
   $2\text{ }B$
3. C.
   $\left( \frac{2}{\sqrt{5}} \right)^{3}\text{ }B$
4. D.
   $\left( \frac{2}{\sqrt{3}} \right)^{3}\text{ }B$

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1. A.
   $9:4$
2. B.
   $12:\sqrt{5}$
3. C.
   $8:1$
4. D.
   $5:\sqrt{3}$

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

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1. A.
   $4:5$
2. B.
   $16:25$
3. C.
   $64:125$
4. D.
   $25:16$

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

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