Given:
Charge Q1 = 3 nC
Distance r1 = 20 cm = 0.2 m
Using the formula for electric field due to a point charge:
\[ E_1 = \frac{k \cdot Q_1}{r_1^2} \]
\[ E_1 = \frac{9 \times 10^9 \times 3 \times 10^{-9}}{(0.2)^2} \]
\[ E_1 = \frac{27 \times 10^{-9}}{0.04} \]
\[
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