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The Figure Shows a 2

Question 25

Multiple Choice

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 5.0 nC/cm2.What is the current of the moving film? 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 5.0 nC/cm<sup>2</sup>.What is the current of the moving film? A) 190 nA B) 23 μA C) 30 nA D) 11 μA


A) 190 nA
B) 23 μA
C) 30 nA
D) 11 μA

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