Two identical capacitors of 10 pF each are connected in series across a 50 V battery. Calculate the electrostatic energy stored in the combination. If these were connected in parallel across the same battery, find out the value of the energy stored in this combination.

Explanation

To solve the problem, we will calculate the electrostatic energy stored in two identical capacitors of 10 pF each when connected in series and then when connected in parallel across a 50 V battery.

### Step 1: Calculate the equivalent capacitance for capacitors in series
For capacitors in series, the formula for equivalent capacitance \( C_s \) is given by:
\[ \frac{1}{C_s} = \frac{1}{C_1} + \frac{1}{C_2} \]
Given that \( C_1 = C_2 = 10 \, \text{pF} \):
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