Determining the Mass of a Selenium Ion in a Bainbridge Mass Spectrometer

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To determine the mass of a singly charged selenium ion in a Bainbridge mass spectrometer, the electric field is 20 V/m and the magnetic field is 10 T. The velocity of the ions can be calculated using the formula v = E/B, which results in a velocity of 2 m/s. The radius of the circular path of the ions is given as 1 m. Using the relationship between the magnetic force and centripetal force, the mass of the selenium ion can be derived. The discussion clarifies that "singly charged" indicates the ion has lost one electron, confirming the charge value is known.
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The electric field between the plates of the velocity selector in a Bainbridege mass spectrometer is 20 V/m, and the magnectic field in both regions is 10 T(out and inside the spectrometer). A stream of singly charged selenium ions moves in a circular path with a radius of 1 m in the magnectic field(after they come out from the spectrometer). Determine the mass of one selenium ion.

How do I get the mass when I don't know the charge?
I know that v=E/B and Forces equal but I just can't find M without knowing the charge.
 
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Unless it means something else, a "singly charged" ion means that an electron has been removed from the selenium atom valence shell. So yes, you do know the amount of charge on the ions.

Zz.
 
THANX!
I think I need to polish my english reading ability!
 

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