Two points are at distances a and `b (a < b)` from a long string of charge per unit length `lambda`.The potential difference between the points in proportional to .............
Options:
(a) `ln(b/a)`
(b) `lambda/(piepsilon_o)ln(b^2/a^2)`
(c) `lambda/(2piepsilon_o)lnsqrt(b/a)`
(d) `lambda/(2piepsilon_o)ln(b/a)`