- #1
henry3369
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Homework Statement
http://imgur.com/EiCFIDe
Homework Equations
E = kq/r2
λ = dq/dx
Q = λa
The Attempt at a Solution
Here is the book solution:
http://imgur.com/aKSeKo0
I need help with part (a). I understand everything in the solution except for the distance they used for between (r2 in the equation above). It seems they used (a+r-x) and they say that is the distance between a segment at x and the charge q. What does q have to do with the problem at all? Part (a) asks for the electric field due to the charge distribution Q where x > a. So shouldn't the distance be between dx(a segment on the charge distribution) and x?
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