The drum of a photocopying machine has a length of 42 cm, Physics

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The drum of a photocopying machine has a length of 42 cm

a) The drum of a photocopying machine has a length of 42 cm and a diameter 12 cm. The electric field now above the drum's surface is 2.3x10⁵ N/C. What is the total charge on the drum?

b) The manufacturer wishes to produce a desktop version of the machine. This needs reducing the drum length to 28 cm and the diameter to 8 cm. The electric field at the drum surface should not change. What must the charge on this new drum?

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Physics: The drum of a photocopying machine has a length of 42 cm

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