Deduce the expression for the electrostatic energy stored in a capacitor of capacitance 'C' and having charge 'Q'.
How will the (i) energy stored and (ii) the electric field inside capacitor be affected when it is completely filled with a dielectric material of dielectric constant 'K'?

Explanation

To derive the expression for the electrostatic energy stored in a capacitor of capacitance 'C' and charge 'Q', we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Capacitor**:
A capacitor consists of two conductive plates separated by an insulating material (dielectric). When connected to a battery, it stores electric charge.

2. **Initial Conditions**:
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