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SOLVE In a fluorescent tube of diameter 3 cm,
34
2.0 x 1018 electrons and 0.5 x 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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While tracking the speed of individual particles is great, a more useful and simpler quantity to measure is current which is the amount of charges moving through some cross-sectional area per unit time. It has units of Coulombs per second (or Amps} and is abbreviated by the symbol i. See if you can write out a formula for the current through a section of wire with cross sectional area A given the average speed of particles v, the charge on each particle, q, and the number of charges per unit volume, n. Use dimensional analysis for this formula. Which of the terms in your formula do you think the electric field can influence?
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