A proton moves through a region of space where there is a magnetic field B⃗ =(0.50i+0.40j)T and an electric field E⃗ =(2.8i−4.0j)×103V/m. At a given instant, the proton’s velocity is v⃗ =(6.1i+2.8j−4.8k)×103m/s.
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