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Principles of Physics a Calculus Based Text

A proton moves through a region containing a uniform electric field given by $\overrightarrow{\mathbf{E}}=50.0 \hat{\mathbf{j}} \mathrm{V} / \mathrm{m}$ and a uniform magnetic field $\overrightarrow{\mathbf{B}}=(0.200 \hat{\mathbf{i}}+0.300 \hat{\mathbf{j}}+0.400 \hat{\mathbf{k}})$ T. Determine the acceleration of the proton when it has a velocity $\overrightarrow{\mathbf{v}}=200 \hat{\mathbf{i}} \mathrm{m} / \mathrm{s}$.