Posted by **samuel** on Tuesday, May 24, 2011 at 11:43pm.

need help with tthe first question on this page!!! please

mail.rdcrd.ab.ca/~smolesky/FOV1-000293AF/5Matter/PracticeWritten.pdf

- physics -
**drwls**, Wednesday, May 25, 2011 at 3:50am
They are asking for a complete writeup of the solution in the form of a statement, assumptions, method, analysis and conclusions. I do not have tiome to do that for you.

The velocity selector has the B field perpendicular to the page, with v*B = E. The Electric force balances the magnetic force. The E field goes from positive to negative plate. Use the right hand rule to get the B direction there.

In the detection chamber,

m v^2/r = B v e, with a different value of B, but the same v as above. Use that to solve for the mass M

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