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# Electric Field Strength

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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.

##### Solution Summary

The electric field strength functions are examined. The charged particles of having a certain velocity is given.

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Ion (velocity 
Selector)

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 ...

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