Part A

In a mass spectrometer, a singly$-$charged particle $($charge $e)$ has a speed of $1\mathrm{.}0{10}^6\frac{m}{s}$ and enters a uniform magnetic fleld of $0\mathrm{.}20$ T $.$ The radius of the circular arbit of the particle is $0\mathrm{.}020$ m $.$ What is the mass of this particle? $)=(1\mathrm{.}60{10}^{-19}C$

$1\mathrm{.}7{10}^{-27}kg$

$4\mathrm{.}5{10}^{-27}kg$

$6\mathrm{.}4{10}^{-28}kg$

$3\mathrm{.}1{10}^{-31}kg$

$3\mathrm{.}2{10}^{-28}kg$

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