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## Homework Statement

Figure 24-32 shows a section of a long, thin-walled metal tube of radius R, carrying a charge per unit length on its surface. Derive expressions for E in terms of distance R from the tube axis, considering both (a) r > R and (b) r < R. Plot your results for the r = 0 to r = 5cm, assuming that λ= 2*10^-8

C=m//and R = 3cm

[i cant put the figure since the question is in the book]

## Homework Equations

q = ε

_{0}∫ E dA

## The Attempt at a Solution

i got the answer to (a) E=λ/2∏rε

_{0}

i dont understand why (b) is 0