1   The cylindrical imagining drum of a photocopier is to have an
electric field just outside its surface of 1.40 x 10^3 N/C A. if the
drum has a surface area of 0.0610m^2 (the area of a 8 ½ X 11in sheet
of paper), what total quantity of charge must reside on the surface of
the drum?  B. if the surface area of the drum is increased to 0.122m^2
so that larger sheets of paper can be used, what total quantity of
chare is required to produce the same 1.40 x 10^5 N/C electric field
just above the surface?

2.	Identical point charges q= +5.00 uC are placed at opposite corners
of a square.  The length of each side of the square is 0.200m.  A
point charge of q0 = -2.00 uC is placed at some of the empty corners. 
How much work is done on q0 by the electric force when q0 is moved to
the other empty corner?

3.	How far apart would parallel pennies have to be to make a 1.00 pF
capacitor?  Does your answer suggest that you are justified in
treating these pennies as infinite sheets? Explain.

4.	At 20 C, the electric field in a tungsten wire is 0.0560 V/m when
the current in the wire is 2.80A.  What electric field in the wire is
required for the same current as 320 C?

Is a "cylindrical imagining drum" cylindrical  -  or does it just think it is?

Months back, someone warned that the exam-question season would come in May.

What about a pact that we commenters just won't post anything to
questions that are obviously homework or exam questions if there are
misspellings?

Researchers can do as they choose.

Cogito ergo cylindrical?

Why not just enforce the policy that we don't answer homework questions?

Ian G.