Question

# The electric intensity due to an infinite cylinder of radius R and  having charge q per unit length at a distance r(r > R) from its axis is

A
Directly proportional to r2
B
Directly proportional to r3
C
Inversely proportional to r
D
Inversely proportional to r2

Solution

## The correct option is D Inversely proportional to r According to Gauss law ∮E.ds=qlϵ0 ∮E.ds=2πrl; (E is constant) ∴E.2πrl=qlϵ0⇒E=q2πϵ0r i.e. E∞1rPhysics

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