Which of the following represents field due to an infinitely long straight uniformly charged wire?

λ/2πεor λ/8πεor λ/4πεor 2λ/πεor

λ/2πεor

Using Gauss law for a cylindrical gaussian surface of length l and radiua r  E. 2$\pi$rl = $\frac{\lambda l}{\epsilon_0}$ $\Rightarrow$ E =  λ/2πεor