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QUESTION
The figure shows a 2.0-cm diameter roller that turns at 90 rpm.
The figure shows a 2.0-cm diameter roller that turns at 90 rpm. A 4.0-cm wide plastic film is being wrapped onto the roller, and this plastic carries an excess electric charge having a uniform surface charge density of 1.4 nC/cm2. What is the current of the moving film?
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