The intensity of the sunlight reaching the earth is $1380\; W/m^2$. Calculate the amplitude of the magnetic field in the light wave. Assume the light to be a plane monochromatic wave.

Question

$\begin {array} {1 1} (a)\;3.4 \times 10^{-6}T & \quad (b)\;34 \times 10^{-8}T \\ (c)\;3.4 \times 10^{-8}T & \quad (d)\;34\: \mu \: T \end {array}$