(a) The drum of a photocopying machine has a length of 42 cm and a diameter of 12 cm.The

Chapter 23, Problem 23

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(a) The drum of a photocopying machine has a length of 42 cm and a diameter of 12 cm.The electric field just above the drums surface is 2.3 105 N/C. What is the total charge on the drum? (b) The manufacturer wishes to produce a desktop version of the machine. This requires reducing the drum length to 28 cm and the diameter to 8.0 cm. The electric field at the drum surface must not change. What must be the charge on this new drum?

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