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March 31, 2015

Homework Help: Physics-PLEASE HELP, it's due soon

Posted by Aya on Saturday, April 3, 2010 at 12:15pm.

Mass-spectrometer (device that selects atomic particles of different masses and charges) consists of cylindrical capacitor with inner radius R1=2.4 cm and outer radius R2=3 cm. Ions enter the mass-spectrometer through narrow slit S which is situated in between the capacitor plates. Uniform magnetic field B=0.2 T is applied parallel to the capacitorís axis. Find potential difference Δ? that should be applied between capacitanceís plates in order for the lithium ion Li+7 (charge +e, mass 7m, m=1.67*10-27 kg) to go around the middle section of the capacitor, i.e. on the circle of R=2.7 cm. Energy of incoming ions is 1000 eV. By how much the potential should be changed in order for lithium ions Li+6 to go around the same trajectory?

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