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A beam of electrons is accelerated through a potential difference of 10 kV before entering a...

A beam of electrons is accelerated through a potential difference of 10 kV before entering a velocity selector. If the B-field of the velocity selector has a value of .010 T, what value of the E-field is required if the particles are to be undeflected?


I have the answer. It is 5.9 x 10^5 V/m. Please thouroughly explain how to get to this answer and what undeflected means.
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Answer #1

When the net force on an electron is zero, it will go undeflected.

(The electric force balances the magnetic force.)

(Kinetic energy acquired by the electron when accelerated by potential V)

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