26. As we approach r = 3.5 cm from the inside, we have E internal = λ 2 πε o r = 1000 N/C . And as we approach r = 3.5 cm from the outside, we have E external = λ 2 πε o r + λ′ 2 πε o r = − 3000 N/C . Considering the difference (
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