Solution

A charged particle moves through a velocity selector at a constant velocity of $4.96 \times 10^{4}\,\mathrm{m\,s^{-1}}$ in a direction perpendicular to both $E$ and $B$. If the magnetic field strength is $0.114\,\mathrm{T}$, what should be the magnitude of electric field intensity so that the particle moves undeflected?