A wire has a current density of 7.47 × 106 A/m². If the cross-sectional area of the wire is 2.39 mm², what current I does the wire carry? I = With this current, how much time t is required for 3.33 × 1020 electrons to pass any point on the wire? t = A S

A wire has a current density of 7.47 × 106 A/m². If the cross-sectional area of the wire is 2.39 mm², what current I does the wire carry? I = With this current, how much time t is required for 3.33 × 1020 electrons to pass any point on the wire? t = A S

Principles of Physics: A Calculus-Based Text

5th Edition

ISBN:9781133104261

Author:Raymond A. Serway, John W. Jewett

Publisher:Raymond A. Serway, John W. Jewett

Chapter21: Current And Direct Current Circuits

Section: Chapter Questions

Problem 6P: Figure P21.6 represents a section of a conductor of nonuniform diameter carrying a current of I =...

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Concept explainers

Microscopic view of current

In physics, the term current is expressed as the rate of flow of electric charges across the area per unit time (I=q/t). It propagates along in the direction of the motion of positive charges. When the current is caused by the motion of electrons, the direction of the current is opposite to the flow.

Question

please answer both parts of this question

A wire has a current density of 7.47 × 106 A/m². If the cross-sectional area of the wire is 2.39 mm², what current I does the
wire carry?
I =
With this current, how much time t is required for 3.33 × 1020 electrons to pass any point on the wire?
t =
A
S

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