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Electromagnetic waves are those in which the electric and magnetic field vectors change sinusoidally and are perpendicular to each other as well as perpendicular to the wave's propagation direction.

Frequency of the electromagnetic wave ia$f=50.0Hz$

Strength of the electric field,$E=13.0kV/m\left(\frac{1000V/m}{1kV/M}\right)=1.30×{10}^{4}V/m$

The relation between the wavelength and frequency can be expressed as,

$\mathrm{λ}=\frac{c}{f}$…â¶Ä¦â¶Ä¦â¶Ä¦â¶Ä¦(1)

Here is the wavelength, c is the speed of light, and f is the frequency.

The relation between the magnetic field and electric field can be expressed as,

$B_0=\frac{E_0}{c}$…â¶Ä¦â¶Ä¦â¶Ä¦â¶Ä¦â¶Ä¦(2)

Here $B_0$is the strength of magnetic field, $E_0$is the strength of electric field, and c is the speed of light.

Substitute the given data in above expression (1), we get,

$$\begin{gathered} \mathrm{λ}=\frac{3×{10}^{8}m/s}{50.0Hz} \\ =6×{10}^{6}m \end{gathered}$$

Therefore, the wavelength of the given low frequency electromagnetic wave.is$6×{10}^{6}m$

Substitute the given data in above expression (2), we get,

$$\begin{gathered} B_0=\frac{13.0×{10}^{}V/m}{3×{10}^{8}m/s} \\ =4.33×{10}^{-5}T \end{gathered}$$

Therefore, the maximum magnetic field strength of the electromagnetic wave is$4.33×{10}^{-5}T$