Question

Two points are at distances a and b (a < b) from a long string of charge per unit length l. The potential difference between the points is proportional to –

• A. b/a
• B. b²/a²
• C. $\sqrt{b/a}$
• D. log(b/a)

Answer 1

Answer: (D)

log(b/a)

Answer 2

E =$\frac { 2 \mathrm {~K} \lambda } { \mathrm { r } }$, dV =–Edr, V=– $\int _ { a } ^ { b } E$ dr V_ab µ log $\left( \frac { \mathrm { b } } { \mathrm { a } } \right)$