Capacitor filled with two or more dielectric slabs: combine the parts in series and parallel

1. A.
   $\frac{\varepsilon_{0}\text{ }A}{\text{ }d}\left( \frac{1}{2} + \frac{K_{1}{\text{ }K}_{2}}{{\text{ }K}_{1} + K_{2}} \right)$
2. B.
   $\frac{\varepsilon_{0}\text{ }A}{\text{ }d}\left( \frac{1}{2} + \frac{K_{1}{\text{ }K}_{2}}{2\left( {\text{ }K}_{1} + K_{2} \right)} \right)$
3. C.
   $\frac{\varepsilon_{0}\text{ }A}{\text{ }d}\left( \frac{1}{2} + \frac{K_{1} + K_{2}}{{\text{ }K}_{1}{\text{ }K}_{2}} \right)$
4. D.
   $\frac{\varepsilon_{0}\text{ }A}{\text{ }d}\left( \frac{1}{2} + \frac{2\left( {\text{ }K}_{1} + K_{2} \right)}{K_{1}{\text{ }K}_{2}} \right)$

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

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1. A.
   $C_{B} > C_{C} > C_{A}$
2. B.
   $C_{C} > C_{B} > C_{A}$
3. C.
   $C_{C} > C_{A} > C_{B}$
4. D.
   $C_{A} > C_{C} > C_{B}$

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