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a) The electric field just above the surface of the charged drum of a photocopying machine has a magnitude E of 2.3 105 N/C.The drum has a length of 40 cm and a diameter of 11 cm. What is the total charge on the drum?

b) The manufacturer wishes to produce a desktop version of the machine. This requires reducing the size of the drum to a length of29 cm and a diameter of 8.0 cm. The electric field at the drumsurface must remain unchanged. What must be the charge on this new drum?

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