A charged particle projected in a limited magnetic field according to figure. The charged particle does not strike to the opposite plate provided
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Charged particle will not strike to opposite plate if $\mathrm{d}>\mathrm{r}$
$\mathrm{d}>\frac{\mathrm{mv}}{\mathrm{qB}} \Rightarrow \mathrm{B}>\frac{\mathrm{mv}}{\mathrm{qd}}$
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