iPad 11:31 AM edugen willeyplus com ctice Assignment Gradebook ORION ment \"u SC

Question

iPad 11:31 AM edugen willeyplus com ctice Assignment Gradebook ORION ment "u SCREEN PRINTER VERSION BACK NEXT Chapter 20, Problem 011 Two wires are identical, except that one is aluminum and one is copper. The aluminum wire has a resistance of 0.3840. What is the resistance of the copper wire? Take the resistivity of copper to be 1.72 x 10 B om, and that of aluminum to be 2.82 x 10-8 m. Number Units Click if you would like to show Work for this question Open Show Work By accessing this Question Assistance, you will learn while you earn points based on the Point Potential Policy set by your Question Attempts: o of 4 used SAVE FOR LATER SUSMITANSwER Earn Maximum Points available only if you answer this question correctly in four attempts or less. Copyright 2000-2017 by John Wiley & Sons, Inc. or related companies. All rights reserved

Explanation / Answer

resistance(R) = resistivity(p) * l/A
so,
let p1 = resistivity of aluminium

p2 =   resistivity of copper

R1 = Resistance of aluminium

R2 = Resistance of copper
so,
   R2/ R1 = p2/p1 ( length of both wire are same )
=> R2/ 0.384 = 1.72 x 10^-8/2.82 x 10-8
=> R2 = 1.72*0.384/2.82
=> R2 = 0.2342 ohm

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