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Two concentric cylinders of radius ra and rb, (ra < rb), are uniformly loaded with q and -2q loads, respectively. Compute the field for (a) r < ra, (b) ra < r < rb and (c) r> rb.

3) Dois cilindros concêntricos de raio rae rb, (ra< rb), estão carregados uniformemente
com cargas qe -2q, respectivamente. Calcule o campo para (a) r < ra, (b) ra <r <rb e (c)
r>rb.

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