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The following figure shows a 4.0-cm-wide plastic film being wrapped onto a 2.0-cm-diameter roller that turns...

The following figure shows a 4.0-cm-wide plastic film being wrapped onto a 2.0-cm-diameter roller that turns at 96 rpm . The plastic has a uniform surface charge density of -1.5 nC/cm2 1) What is the current of the moving film? 2)How long does it take the roller to accumulate a charge of -10 μC?

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