The intensity of the light from a bulb incident on a surface is \( 0.22 \, \text{W/ m}^{2} \). The amplitude of the magnetic field in this light-wave is __________ \( \times 10^{-9} \, \text{T} \).
(Given : Permittivity of vacuum \( \varepsilon_{0} = 8.85 \times 10^{-12} \, \text{C}^{2}\, \text{N}^{-1}\, \text{m}^{-2} \) , speed of light in vacuum \( c = 3 \times 10^{8} \, \text{m s}^{-1} \) )
