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## Homework Statement

i'm having a bit of trouble understanding/visualising why the electric potential is zero in the red cross within region III and the green dot within region II

from my current understanding, the green dot is where the potentials from both charges are equal and opposite therefore cancel out (am I right?), but I have no idea why the electric potential is zero at the red cross

can anyone help me out?

## Homework Equations

V = kq/r