Electric Potential

Two point charges sit on a line and a probe slides between them. The total potential is the plain sum of the two contributions beside it — no angles, no components. At the midpoint of a +5 / -5 nC pair V is exactly zero while the field is 359.5 N/C; flip one sign and it is the field that vanishes instead. V = k·Q / r, with k = 8.9875e9 N·m²/C².

Charge Q1 (left)+5.0 nC
Charge Q2 (right)-5.0 nC
Separation1.00 m
Probe position0.000 m
k = 8.9875e9 N·m²/C² · point charges in a vacuum · V = 0 at infinity · potentials add as plain numbers
Total potential at the probe  V = k·Q / r, added up
0.000 V
Net field along x  Ex = -dV/dx
+359.5 N/C
Where V = 0 on the axis
x = 0.000 m
Where E = 0 on the axis
nowhere on the axis
Potential from Q1
+89.88 V
Potential from Q2
-89.88 V
Distance to Q1
0.500 m
Distance to Q2
0.500 m
Probe
x = 0.000 m
Arrangement
+5.0 nC and -5.0 nC, 1.00 m apart