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HPRF
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Homework Statement
A beam of ions enters a region in which the electric field E and magnetic flux density B are normal to each other and both normal to the velocity of the ions. Show that if the velocity of the ions is related to the fields by
v=ExB/B2
then the ions pass through the region undeflected.
Homework Equations
Thinking of using
F=qvxB
but not sure.
The Attempt at a Solution
Substituting v from info into Lornetz force equation but it doesn't seem to answer the question.