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## Homework Statement

In the case of the b trajectories, I want to understand why the electrochemical potential at voltage contact 3 must be the same as the current contact 4. And can you say anything about the electrochemical potential inside the sample itself?

## Homework Equations

**-**I know that a voltage contact adjusts its electrochemical potential to the value needed to create a net current of 0.

- I know that electrons move from a high electrochemical potential to a low electrochemical potential.

## The Attempt at a Solution

I could say that the net current between 4 and 3 is 0, so the potentials must be the same. But there is also no net current between 4 and 1, so why can't you say the same about the potentials of 4 and 1. And also between 2 and 3. And what is the potential inside the sample itself