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iPad 11:01 AM 82% session.masteringphysics.com Apple Disney ESPN Yahoo! Coolest Homemade Costumes - Web's Largest Halloween Costume Galleryy Assignments MasteringPhysics: Assignment #5 MasteringPhysics: User Settings Engineering Physics Spring 2016 Problem 25.30 Help |Close Assignment #5 Resources « previous | 8 of 17 | next » Problem 25.30 A hollow cylindrical resistor with inner radius ri and outer radius r2 , and length 1, is made of a material whose resistivity is (see the figure ) r2 Part A Find the resistance for current that flows radially outward. [Hint: Divide the resistor into concentric cylindrical shells and integrate.) Express your answer in terms of the variables . 1 , 2, and appropriate constants r 2 Submit My Answers Give Up Correct

Explanation / Answer

B) R = (rho / 2pi L) ln(r2/r1)

= (15 x 10^-5 / ( 2 x pi x 0.032) ln(3/1.8)

= 3.81 x 10^-4 ohm

C) Resistance parallel to the axis,.

R = rho L /A = (rho L ) / (pi (r2^2 - r1^2))

= (15 x 10^-5 x 0.032) / (pi x (0.003^2 - 0.0018^2))

= 0.265 ohm

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