A straight, cylindrical wire lying along the x-axis has a length L and a diameter d. It is made of a material described by Ohm's law with a resistivity p. Assume potential V is maintained at the left end of the wire at x = 0. Also, assume the potential is zero at x = L. In terms of L, d, V, p and physical constants, derive expressions for the current density in the wire. Select one: O a. J = O b. J = VpL Oc. J= Va O d. J = O e. J = pL

A straight, cylindrical wire lying along the x-axis has a length L and a diameter d. It is made of a material described by Ohm's law with a resistivity p. Assume potential V is maintained at the left end of the wire at x = 0. Also, assume the potential is zero at x = L. In terms of L, d, V, p and physical constants, derive expressions for the current density in the wire. Select one: O a. J = O b. J = VpL Oc. J= Va O d. J = O e. J = pL

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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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

A straight, cylindrical wire lying along the x-axis has a length L and a diameter d. It is made of a material described by Ohm's law with a
resistivity p. Assume potential V is maintained at the left end of the wire at x = 0. Also, assume the potential is zero at x = L. In terms of
L, d, V, p and physical constants, derive expressions for the current density in the wire.
Select one:
O a. J =
O b. J = VpL
O c. J = 4
Vd
O d. J= %
O e. J = pL
е.

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