Two positive point charges of `0.2 muC and 0.01 muC` are placed 10 cm apart. Calculate the work done in reducing the distance to 5 cm.

Explanation

To calculate the work done in reducing the distance between two positive point charges from 10 cm to 5 cm, we can follow these steps:

### Step 1: Understand the concept of electric potential energy
The electric potential energy (U) between two point charges \( Q_1 \) and \( Q_2 \) separated by a distance \( r \) is given by the formula:
\[ U = \frac{1}{4 \pi \epsilon_0} \cdot \frac{Q_1 Q_2}{r} \]
where \( \epsilon_0 \) is the permittivity of free space, approximately \( 8.85 \times 10^{-12} \, \text{C}^2/\text{N m}^2 \).
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