Mutual inductance of two concentric coplanar loops (small loop at the centre of a large one)

1. A.
   $\frac{\mu_0 \pi (r_1+r_2)^2}{2r_2}$
2. B.
   $\frac{\mu_0 \pi (r_1-r_2)^2}{2r_1}$
3. C.
   $\frac{\mu_0 \pi r_1^2}{2r_2}$
4. D.
   $\frac{\mu_0 \pi r_2^2}{2r_1}$

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1. A.
   $\frac{\mu_0 \pi r_2^2}{2r_1}$
2. B.
   $\frac{\mu_0 \pi^2 r_1 r_2}{2}$
3. C.
   $\frac{\mu_0 \pi r_1^2}{2r_2}$
4. D.
   $\frac{\mu_0 \pi r_2^2 \pi^2}{2r_1}$

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1. A.
   $\frac{R_1}{R_2}$
2. B.
   $\frac{R_2}{R_1}$
3. C.
   $\frac{R_1^2}{R_2}$
4. D.
   $\frac{R_2^2}{R_1}$

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1. A.
   $\dfrac{\mu_0\pi r_2^2}{2r_1}$
2. B.
   $\dfrac{\mu_0\pi r_2}{2r_1}$
3. C.
   $\dfrac{\mu_0\pi r_2^2}{2r_1^2}$
4. D.
   $\dfrac{\mu_0\pi r_2}{2r_1}$

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1. A.
   $\frac{\mu_0 \pi R^2}{2r}$
2. B.
   $\frac{\mu_0 \pi r^2}{2R}$
3. C.
   $\frac{\mu_0 \pi r^2}{R}$
4. D.
   $\frac{\mu_0 \pi R^2}{r}$

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

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1. A.
   $\frac{\mu_{0}\pi r_{1}^{2}}{2r_{2}}$
2. B.
   $\frac{\mu_{0}\pi r_{1}^{2}}{2r_{1}}$
3. C.
   $\frac{\mu_{0}\pi\left( r_{1} + r_{2} \right)^{2}}{2r_{1}}$
4. D.
   $\frac{\mu_{0}\pi\left( r_{1} - r_{2} \right)^{2}}{2r_{2}}$

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1. A.
   $\dfrac{\mu_0\pi r_2}{2r_1}$
2. B.
   $\dfrac{\mu_0\pi r_1^2}{2r_2}$
3. C.
   $\dfrac{\mu_0\pi r_1}{2r_2}$
4. D.
   $\dfrac{\mu_0 r_2^2\pi}{2r_1}$

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1. A.
   $\dfrac{r}{R}$
2. B.
   $\dfrac{R}{r}$
3. C.
   $\dfrac{R^2}{r}$
4. D.
   $\dfrac{r^2}{R}$

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1. A.
   $\dfrac{\mu_0\pi r_1^2}{2\,r_2}$
2. B.
   $\dfrac{\mu_0\pi r_2^2}{2\,r_1}$
3. C.
   $\dfrac{\mu_0\pi(r_1 + r_2)^2}{2\,r_1}$
4. D.
   $\dfrac{\mu_0\pi(r_1 - r_2)^2}{2\,r_2}$

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1. A.
   $\pi\mu_0r$
2. B.
   $\dfrac{\mu_0\pi r}{4}$
3. C.
   $\dfrac{\mu_0\pi r}{2}$
4. D.
   $\dfrac{\mu_0\pi r}{8}$

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1. A.
   $\dfrac{r_1}{r_2}$
2. B.
   $\sqrt{\dfrac{r_1^2}{r_2}}$
3. C.
   $\dfrac{r_2^2}{r_1}$
4. D.
   $\dfrac{r_2}{r_1}$

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