PLEASE FIND THE ELECTRIC POTENTIAL DUE TO A  INFINTE LINE  CHARGE

SOME WHAT LIKE THIS FIGURE AT POINT 00(NOT AT THE CENTRE .ALSO IN TERMS OF ANGLE)

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go to

http://books.google.co.in/books?id=yk6ZzkEnFAMC&pg=PA861&lpg=PA861&dq=electric+potential+at+a+point+due+to+a+infinite+line+charge&source=web&ots=yfbAJbQFOq&sig=O_tSbNydadii7Vfz74VykucbkAo&hl=en

Arre. Ans is lambda/2pi epsilon o r