An electron moves through a uniform magnetic field given by vec$(B)=B_x$hat$(i)+(2\mathrm{.}12B_x)hat(j).$ At a particular instant, the electron has velocity vec$(v)=(1\mathrm{.}89$hat$(i)+4\mathrm{.}70$hat$(j))\frac{m}{s}$ and the magnetic force acting on it is $(3\mathrm{.}82{10}^{-19})widehat(k)N.$ Find $B_x.$

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