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An electron of energy $2000\;eV$ describes a path in magnetic field of flux density $0.2\;T$ What is the radius of this path ?

$\begin{array}{1 1} 7.5 \times 10^4 \;m \\ 7.5 \times 10^{-4}\;m \\ 7.5 \times 10^{5}\;m \\ 7.5 \times 10^{-5}\;m \end{array} $

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