Which of the following expression is correct for electric field strength?
A. $${\text{E}} = {\text{D}} \in $$
B. $${\text{E}} = \frac{{\text{r}}}{ \in }$$
C. $${\text{E}} = \pi {\text{D}}$$
D. $${\text{E}} = \frac{{\text{D}}}{ \in }$$
Answer: Option D

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