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Assume there is a line of linear charge density λ(z) = αz and length 2a that...

Assume there is a line of linear charge density λ(z) = αz and length 2a that lies along the z-axis. The line is centered at the origin, so that one end is at z = −a with the other at z = a. What is the potential difference V(0, 0, 2a) − V(0, 0, −2a)?

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