Uniform volume charge density
An infinitely long cylinder of radius 4.0 cm carries a uniform volume charge density r = 200 nC/m3. What is the electric field at r = 4.1 cm?
a. zero
b. 0.11 kN/C
c. 57 N/C
d. 0.44 kN/C
e. 0.23 kN/C
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