Consider the mass spectrometer as shown in the figure. The electric field between the plates is $E \ V/m$,and the magnetic field in both the velocity selector and in the deflection chamber has magnitude $B$. Find the radius $r$ for a singly charged ion of mass $m$ in the deflection chamber.

  • A
    $\frac{mE}{eB}$
  • B
    $\frac{mE^2}{eB}$
  • C
    $\frac{mE}{eB^2}$
  • D
    $\frac{mE}{Be^2}$

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