r = 2 cm = 0,02 m
[tex]E = k \frac{Q}{ {r}^{2} } \\ \\ E = 9 \: . \: {10}^{9} \: . \: \frac{4 \: . \: {10}^{ - 6} }{(0,02)^{2} } \\ \\ E = 9 \: . \: {10}^{9} \: . \: \frac{4 \: . \: {10}^{ - 6} }{2 \: . \: {10}^{ - 4} } \\ \\ E = 9 \: . \: 2 \:. \: {10}^{9} \: . \: {10}^{ - 2} \\ \boxed{ E = 1,8 \: . \: {10}^{8} \: \frac{N}{C} }[/tex]
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r = 2 cm = 0,02 m
[tex]E = k \frac{Q}{ {r}^{2} } \\ \\ E = 9 \: . \: {10}^{9} \: . \: \frac{4 \: . \: {10}^{ - 6} }{(0,02)^{2} } \\ \\ E = 9 \: . \: {10}^{9} \: . \: \frac{4 \: . \: {10}^{ - 6} }{2 \: . \: {10}^{ - 4} } \\ \\ E = 9 \: . \: 2 \:. \: {10}^{9} \: . \: {10}^{ - 2} \\ \boxed{ E = 1,8 \: . \: {10}^{8} \: \frac{N}{C} }[/tex]