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A very long, uniformly charged cylinder has radius R and linear charge density λ

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A very long, uniformly charged cylinder has radius R and linear charge density λ.

Part A

Find the cylinder's electric field strength outside the cylinder, r≥R. Give your answer as a multiple of λ/ε0.

Express your answer in terms of some or all of the variables R, r, and the constant π.

Part B

Find the cylinder's electric field strength inside the cylinder, r≤R. Give your answer as a multiple of λ/ε0.

Express your answer in terms of some or all of the variables R, r, and the constant π.