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venom_h
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Homework Statement
A long metal cylinder with radius a is held on the axis of a long, hollow, metal tube with radius b. The inner cylinder has positive charge per unit length [tex]\lambda[/tex], and the outer cylinder has an equal negative charge per unit length. Calculate the potential V(r) for r<a
Homework Equations
Va-Vb = [tex]\int[/tex]E.dr, where E can be found by Gauss's law
The Attempt at a Solution
My only problem is why the limit for the integral is from a to b even though r < a ??
How does any point r < a experience a potential outside??
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