Electromagnetic Waves: JEE Main 2026 Physics question

A laser beam has intensity of $4.0\times10^{14}$ W/m$^2$. The amplitude of magnetic field associated with beam is ________ T. (Take $\epsilon_0=8.85\times10^{-12}$ C$^2$/N m$^2$ and $c=3\times10^8$ m/s)