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Figure P27.42 shows a 4.0-cmwide plastic film being

Physics for Scientists and Engineers: A Strategic Approach, Standard Edition (Chs 1-36) | 4th Edition | ISBN: 9780134081496 | Authors: Randall D. Knight (Professor Emeritus) ISBN: 9780134081496 191

Solution for problem 27.71 Chapter 27

Physics for Scientists and Engineers: A Strategic Approach, Standard Edition (Chs 1-36) | 4th Edition

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Physics for Scientists and Engineers: A Strategic Approach, Standard Edition (Chs 1-36) | 4th Edition | ISBN: 9780134081496 | Authors: Randall D. Knight (Professor Emeritus)

Physics for Scientists and Engineers: A Strategic Approach, Standard Edition (Chs 1-36) | 4th Edition

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Problem 27.71

Figure P27.42 shows a 4.0-cmwide plastic film being wrapped onto a 2.0-cm-diameter roller that turns at 90 rpm. The plastic has a uniform surface charge density of -2.0 nC/cm2 . a. What is the current of the moving film? b. How long does it take the roller to accumulate a charge of -10 mC?

Step-by-Step Solution:
Step 1 of 3

EZ r.r{-\ fi,^- / S :l I Sf pr'l 5v# ta az\YYt l . 5q"CII-C ' ) . -

Step 2 of 3

Chapter 27, Problem 27.71 is Solved
Step 3 of 3

Textbook: Physics for Scientists and Engineers: A Strategic Approach, Standard Edition (Chs 1-36)
Edition: 4
Author: Randall D. Knight (Professor Emeritus)
ISBN: 9780134081496

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Figure P27.42 shows a 4.0-cmwide plastic film being