Two identical capacitors when one of them is filled with a dielectric

1. A.
   $\frac{C}{2}\cdot\frac{K+1}{K-1}$
2. B.
   $\frac{2C(K-1)}{K+1}$
3. C.
   $\frac{C}{2}\cdot\frac{K-1}{K+1}$
4. D.
   $\left(\frac{C}{2}\cdot\frac{K-1}{K+1}\right)^2$

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1. A.
   $\frac{Q'_A}{Q_A} = \frac{K}{2}$
2. B.
   $\frac{Q'_B}{Q_B} = \frac{K+1}{2}$
3. C.
   $\frac{Q'_A}{Q_A} = \frac{K+1}{K}$
4. D.
   $\frac{Q'_B}{Q_B} = \frac{K+1}{2K}$

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1. A.
   $\frac{C}{(K - 1)}$
2. B.
   $\frac{KC}{K - 1}$
3. C.
   $KC + 1$
4. D.
   $C(K - 1)$

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1. A.
   $\dfrac{KV}{K + 1}$
2. B.
   $\dfrac{KV}{K - 1}$
3. C.
   $\dfrac{K + 1}{KV}$
4. D.
   $\dfrac{K - 1}{KV}$

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1. A.
   $\dfrac{C}{2}\left[\dfrac{K - 1}{K + 1}\right]^2$
2. B.
   $\dfrac{C}{2}\left[\dfrac{K + 1}{K - 1}\right]^2$
3. C.
   $\dfrac{2}{C}\left[\dfrac{K - 1}{K + 1}\right]$
4. D.
   $\dfrac{C}{2}\left[\dfrac{K - 1}{K + 1}\right]$

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