\(=830 \times 10^{3} \,\mathrm{Hz}\)

Magnetic field. \(B=4.82 \times 10^{-11}\, \mathrm{T}\)

As we know. frequency, \(v=\frac{c}{\lambda}\) or 

\(\lambda=\frac{c}{r}=\frac{3 \times 10^{8}}{830 \times 10^{2}}\)

\(\lambda =360\, \mathrm{m}\) 

\(\text { And. } E =B C=4.82 \times 10^{-11} \times 3 \times 10^{8} \)

\(=0.014 \,\mathrm{N} / \mathrm{C} \)