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Two point are at distance r(1)" and " r(...

Two point are at distance `r_(1)" and " r_(2)(r_(1)ltr_(2))`from a long string having charge per unit length `sigma`. The potential difference between the points is proportional to

A

`sigma`

B

`log((r_(2))/(r_(1)))`

C

`(1)/(sigma)`

D

`(r_(2))/(r_(1))`

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