62Ă—10^(-6) C and the distance from point A to the corner D is 0.79 mm (0.79 x 10^(-3) m), we can use the formula for electric field due to a point charge:
\[ E_A = \frac{k \cdot q}{r^2} \]
where \( k = 9 \times 10^9 \, Nm^2/C^2 \) is the Coulomb's constant, \( q =
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