question_answer

The electric intensity due to an infinite cylinder of radius  and having charge q per unit length at a distance from its axis is                                  [MP PMT 1993; AFMC 2000]

A)                    Directly proportional to

B)                    Directly proportional to  

C)                    Inversely proportional to r

D)                    Inversely proportional to

Correct Answer: C

Solution :

                   According to Gauss law    (E is constant) \  Þ   i.e.