Question

Two equal and opposite charge $(+ q$ and $- q)$ are situated at $x$ distance from each other, the value of potential at very far point will depend upon

• A. only on q
• B. only on x
• C. on qx
• D. on $\frac{q}{x}$

Answer 1

Answer: (C)

on qx

Answer 2

Electric potential due to electric dipole at axial line $E_{\text {axial }}=\frac{k(2 q x)}{\left(r^{2}-x^{2}\right)}$ where $r$ is the distance of observation point from centre of dipole. For general point $E_{q}=\frac{1}{4 \pi \varepsilon_{0}} \frac{2 q x \cos \theta}{r^{2}}$ So, the value of potential depends on $q x$.