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## Homework Statement

These question deal with a mass spectrometer whose slits are separated by .1 m.

a) Trying to calibrate it using protons, for B=.2T, the proton starting at rest should be accelerated through a voltage of _________ to have it pass through the two slits.

b) To set it with He2+ ions, with 2 protons and 2 neutrons, so that they pass through both slits, they need a voltage of _________. (Take into account a fixed geometry where r and B are constant.

c) Assuming that the earth's magnetic field ifs 0.5x10^-4 and is perpendicular to path of particles, how much error is possible using the He2+ particles?

## Homework Equations

1/2mv^2=qV

F = qvB

qE = qvB -->

## The Attempt at a Solution

a) should i use the 3rd equation for this one?

b) same equation but change value for q to 2q?

c) I have no idea on this one

Please help, I'm so lost in this problem.