Capacitor with dielectrics side by side, each filling part of the plate area

1. A.
   7.5
2. B.
   3
3. C.
   4
4. D.
   5

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1. A.
   $10\,\mu F$
2. B.
   $20\,\mu F$
3. C.
   $30\,\mu F$
4. D.
   $40\,\mu F$

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

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