Capacitance with a dielectric slab of thickness t between the plates (formula)

1. A.
   $\frac{A\varepsilon_0}{2\left(d - t\left(1-\frac{1}{k}\right)\right)}$
2. B.
   $\frac{A\varepsilon_0}{d + t\left(1+\frac{1}{k}\right)}$
3. C.
   $\frac{A\varepsilon_0}{d - t\left(1-\frac{1}{k}\right)}$
4. D.
   $\frac{A\varepsilon_0}{d - t\left(1+\frac{1}{k}\right)}$

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1. A.
   $\dfrac{\epsilon_0A}{(d - t) + \dfrac{t}{2k}}$
2. B.
   $\dfrac{\epsilon_0A}{(d - t) - \dfrac{t}{k}}$
3. C.
   $\dfrac{\epsilon_0A}{(2d - t) - \dfrac{t}{2k}}$
4. D.
   $\dfrac{\epsilon_0A}{(d - 2t) - \dfrac{t}{k}}$

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