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Ion (velocity ->
Selector)

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E= electric field

B= magnetic field

It is possible to use crossed electric and magnetic fields to construct a velocity selector, a device that only passes charged particles having a certain velocity. Once way of constructing such a velocity selector is shown in the picture above; ions are sent through a region of space where there is a uniform magnetic field (directed upward out of the page).

Only ions having a specific speed will be able to travel in a straight line through this apparatus. If the magnetic field strength is B=30 MN/C, what electric field strength would we want to select ions having a speed exactly 0.01c. Dow this answer depend on the mass of the ion? Does this depend on the sign of the ion's charge? Does it depend on the magnitude of the ion's charge? Ignore gravity

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