Question: 4. Un conducteur cylindrique de rayon a et longueur infinie portant densit de charge ps est entour par un matriel dilectrique de constante dilectrique

4. Un conducteur cylindrique de rayon a et longueur infinie portant densit de charge ps est entour par un matriel dilectrique de constante dilectrique e = 3Co et rayon externe b, et le tout est dans l'eau distille, = 80. (a) Quels sont E, et partout dans l'espace ? (b) Quels sont les densits de charge captives (i. e. lies) ? (c) Quel travail a-t-il fallu dpenser pour assembler cette distribution de charges, par unit de longueur du systme ? Pensez-vous qu'un tel fil infini est possible en pratique ? z

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