A parallel plate capacitor has capacitance $C$. If it is equally filled with parallel layers of materials of dielectric constants $K_1$ and $K_2$ its capacity becomes $C_1$. The ratio of $C_1$ to $C$ is
A parallel plate capacitor has capacitance $C$. If it is equally filled with parallel layers of materials of dielectric constants $K_1$ and $K_2$ its capacity becomes $C_1$. The ratio of $C_1$ to $C$ is
- A
${K_1} + {K_2}$
- B
$\frac{{{K_1}{K_2}}}{{{K_1} - {K_2}}}$
- C
$\frac{{{K_1} + {K_2}}}{{{K_1}{K_2}}}$
- D
$\frac{{2{K_1}{K_2}}}{{{K_1} + {K_2}}}$
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$(b)$ What is the potential of the inner sphere?
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