Question

A velocity selector consists of electric and magnetic fields described by the expressions E = E...

A velocity selector consists of electric and magnetic fields described by the expressions
E = E k
and
B = B ĵ,
with B = 25.0 mT. Find the value of E (in kV/m) such that a 770 eV electron moving in the negative x-direction is undeflected.
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Answer #1

Find the speed of electron and for no deflection the sum of magnetic force and electric force must be zero. Using this condition we find the value of electric field as shown below

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