The intensity of the light from a bulb incident on a surface is $0.22 \mathrm{~W} / \mathrm{m}^2$. The amplitude of the magnetic field in this light-wave is $\_\_\_\_$ $\times 10^{-9} \mathrm{~T}$ Given : Permittivity of vacuum $\epsilon_0=8.85 \times 10^{-12} \mathrm{C}^2 \mathrm{~N}^{-1} \mathrm{~m}^{-2}$, speed of light in vacuum $\mathrm{c}=3 \times 10^8 \mathrm{~ms}^{-1}$ )