- #1
fight_club_alum
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Homework Statement
The charge of density 3.0 μC/m fills a long cylindrical region having a 2.0-cm radius. If point A is 1.0 cm from the symmetry-axis and point B is 2.0 cm from the symmetry-axis, what is the potential difference VA – VB?
a . –25 mV
b. +42 mV
c. –42 mV
d. +25 mV
e. +20 mV <- answer
Homework Equations
- integral( E . dr) = delta V
The Attempt at a Solution
EA = Q/eo
E(2*pi*r*h) = lambda * h / eo
E = (lambda) /( eo * 2 * pi * r)
-integral(lambda/eo* 2 * r * pi) dr from 0.01 ro 0.02 <--- gives me the wrong answer