In a fluorescent tube of diameter 3.0 cm, 2.0 1018 electrons and 0.5 1018 positive

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In a fluorescent tube of diameter 3.0 cm, 2.0 × 1018 electrons and 0.5 × 1018 positive ions (with a charge of +e) flow through a cross-sectional area each second. What is the current in the tube?

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