Find the capacitance between the terminals `A` and `C_(3)` If `epsilon_(r) = 2`

Explanation

To find the capacitance between terminals A and C3 (which is actually point B), we will follow these steps:

### Step 1: Understand the Configuration
We have two capacitor plates with a distance \(D\) between them and an area \(A\). The relative permittivity of the medium is given as \(\epsilon_r = 2\).

### Step 2: Identify the Capacitance Formula
The capacitance \(C\) of a parallel plate capacitor is given by the formula:
\[
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