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The magnetic field vec$(B)(z,t)$ of a plane monochromatic electromagnetic wave of wavelength $=681nm$ that is propagating in a vacuum in the $z$ direction is described by:

vec$(B)(z,t)=B_{1}sin(kz-t)(hat()+$hat$())$

where $B_1=9\mathrm{.}00{10}^{-6}T,$ and hat$()$ and hat$()$ are the unit vectors in the positive$-x$ and positive$-y$ directions, respectively.

${?}^{00}$ What is the amplitude $E_{\text{m}\text{a}\text{x}}$ of the electric field oscillations?

$E_{\text{m}\text{a}\text{x}}=$