Calculate the electric potential energy due to the electric repulsion between two nuclei of `_^(12)C` when they touch each other at the surface.

Explanation

To calculate the electric potential energy due to the electric repulsion between two carbon-12 nuclei when they touch each other, we can follow these steps:

### Step 1: Understand the Formula for Electric Potential Energy
The electric potential energy \( U \) due to the electric repulsion between two point charges is given by the formula:
\[ U = \frac{Q_1 Q_2}{4 \pi \epsilon_0 r} \]
where:
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