You measure the current in two different wires using an ammeter, and find them to be the same. One wire is thick, the other is thin. Which has the larger current density, and how do you know?
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You measure the current in two different wires using an ammeter, and find them to be the same. One wire is thick, the other is thin. Which has the larger current density, and how do you know?
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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?The electromotive force from a battery drives a current around the circuit shown in the figure. Measurements indicate that 6250 μC of charge pass point A in 10.0 s. A Device (a) What is the current in the circuit? i (b) How many electrons pass point A per second? i (c) What direction are the electrons flowing around the circuit? Save for Later x 10-4 A x 1015 electrons/s Attempts: 0 of 3 used Submit AnswerWhat is the magnitude of the current density across A1? Is the current at A2 larger, smaller, or the same? Is the current density at A2 larger, smaller, or the same? Assume A2 = 2A1.
- this problems is giving me hard timeAnswer HANDWRITTEN answer ONLY. Thanks will give like for sureAn aluminum wire having a cross-sectional area equal to 2.90 x 10-6 m² carries a current of 4.50 A. The density of aluminum is 2.70 g/cm³. Assume each aluminum atom supplies one conduction electron per atom. Find the drift speed of the electrons in the wire. mm/s Need Help? Read It