What is the total charge on the drum?

Posted on 1970-01-01 00:00:00 in Physics by CAROLINE

(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 49 cm and a diameter of 10 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 of 29 cm and a diameter of 8.0 cm. The electric field at the drum surface must remain unchanged. What must be the charge on this new drum?

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