na closed сп it, an electh current of intensity i goes thro esistance R. The electric potential at the edges of Ris meas now we write vould this generally bethe definition ofthe resistance quan

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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Question 1
a) Ina closed circuit, an electric current of intensity i goes through a resistor of
resistance R. The electric potential at the edges of R is measured to be V. If
now we write
R
would this generally bethe definition ofthe resistance quantity R, or the
expression of Ohm's Law? Explain.
b) We define the resistivity (via the familiar notation) as
E
「了,
Thus show that the resistance R can be written as,
R =p!
A
here Lis the length ofthe resistor, and A is the cross-sectional area ofit.
c) Let J the curent density (i/A). Express J in tems of the electron density n
(electrons/m'), the electron drift velocity va, and the electron charge e.
Transcribed Image Text:Question 1 a) Ina closed circuit, an electric current of intensity i goes through a resistor of resistance R. The electric potential at the edges of R is measured to be V. If now we write R would this generally bethe definition ofthe resistance quantity R, or the expression of Ohm's Law? Explain. b) We define the resistivity (via the familiar notation) as E 「了, Thus show that the resistance R can be written as, R =p! A here Lis the length ofthe resistor, and A is the cross-sectional area ofit. c) Let J the curent density (i/A). Express J in tems of the electron density n (electrons/m'), the electron drift velocity va, and the electron charge e.
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