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A beam of electrons is accelerated through a potential difference of 12.0 kV before entering a...

A beam of electrons is accelerated through a potential difference of 12.0 kV before entering a velocity selector. If the B-field of the velocity selector is perpendicular to the velocity and has a value of 0.02 T, what value of the E-field is required (in the magnetic field region) if the particles are to be undeflected?

It's not 1.949*10^6.

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