Figure P27.42 shows a 4.0-cm-wide plastic film being wrapped onto a 2.0-cm-diameter roller that turns at 90

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Figure P27.42 shows a 4.0-cm-wide 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.

4.0 cm 2.0 cm FIGURE P27.42 a. What is the current of the moving film?
b. How long does it take the roller to accumulate a charge of -10 μC? 

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