Choose the correct statement:
Three charges $2q, q, -q$ are located at the vertices of an equilateral triangle. At the centroid:
Answer & explanation
Correct answer: option 4
The correct answer is Option (2) → potential is zero but the field is non-zero
The electric field is a vector quantity, and its direction depends on the distribution of charges. Due to a symmetry in charge magnitude $(+2q, +q, -q)$, the electric field at the centroid is non-zero.
Potential at the centroid is -
$V=\frac{K}{r}(2q)+\frac{K}{r}(q)-\frac{K}{r}(q)$
$≠0$