HW $12$ Electromagnetic Waves

Key Example Variation Problem $32\mathrm{.}2$

Part I

A dental laser emits a sinusoidal electromagnetic wave that propagates in vacuum in the positive xx$-$direction with wavelength $3\mathrm{.}44$ mm$.$ At xx $=0$ and tt $=0$ the electric field E$$E$$ points in the $+$y$+$y$-$direction and its magnitude equals the amplitude EmaxEmax $=9\mathrm{.}20$ MV$/$mMV$/$m$.$ Find the magnitude of the magnetic field B$$B$$ at xx $=0$ and tt $=0.$

Express your answer with the appropriate units.