Figure P27.42 shows a 4.0-cmwide plastic film being
Chapter 27, Problem 27.71(choose chapter or problem)
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?
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