Given:
\( r = 2.08 \, \mu m = 2.08 \times 10^{-6} \, m \)
\( \varepsilon_0 = 8.85 \times 10^{-12} \, F/m \)
\( e = 1.6 \times 10^{-19} \, C \)
Substitute the values into the formula:
\( k = \frac{1}{4\pi \times 8.85 \times 10^{-12}} \times \frac{(1.6 \times
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