Given:
Charge $Q = +1.00 \, \text{nC}$ (which is $1.00 \times 10^{-9} \, \text{C}$)
Distance from charge at A to point D, $r = 1.0 \, \text{m}$
Using the formula for electric field $E = \dfrac{KQ}{r^2}$, where $K$ is the electrostatic constant ($9.0 \times 10^9
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