Answer
$E_{max}$=$1.2\times10^{4}$N/C
Work Step by Step
The maximum value of plot of E is as follows
$E_{max}$=$\frac{λ}{2πrϵ̻}$
$E_{max}$=$\frac{(2\times10^{-8})}{2π(0.03m)(8.85\times10^{-12})}$
$E_{max}$=$1.2\times10^{4}$N/C
