How will capacitance of a parallel plate capacitor change on inserting a metal slab partially between its plates?

Explanation

To determine how the capacitance of a parallel plate capacitor changes when a metal slab is partially inserted between its plates, we can follow these steps:

### Step 1: Understand the Initial Capacitance
The initial capacitance \( C_0 \) of a parallel plate capacitor without any dielectric is given by the formula:
\[ C_0 = \frac{\varepsilon_0 A}{D} \]
where:
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