Find the dimensional formula of `epsilon_0` .

Explanation

To find the dimensional formula of \( \epsilon_0 \) (the permittivity of free space), we start from the equation for the electrostatic force:

\[ F = \frac{1}{4 \pi \epsilon_0} \cdot \frac{q_1 q_2}{r^2} \]

### Step 1: Rearranging the Formula
We can rearrange this equation to express \( \epsilon_0 \):
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