A singly ionized magnesium atom $(A=24)$ ion is accelerated to kinetic energy $5\,keV$ and is projected perpendicularly into a magnetic field $B$ of the magnitude $0.5\,T$. The radius of path formed will be___________ $cm$
JEE MAIN 2022, Medium
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$R =\frac{ mv }{ qB }=\frac{\sqrt{2 mK }}{ qB }$
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