Consider the passage of a horizontal electron beam through a velocity selector,

Question

Consider the passage of a horizontal electron beam through a velocity selector, where the electric field E points downward and the magnetic field B point into the paper. Based on the Lorentz force law, what is the critical speed v (the speed at which the horizontal electron beam is not deflected)?
If the speed of the electron is greater than the critical speed, the trajectory of the elctron beam will be 1. deflected into the paper 2. deflected downward and out the paper 3. defledted out of the paper 4.deflected downward and into the paper 5. undeflected. or what else... Consider the passage of a horizontal electron beam through a velocity selector, where the electric field E points downward and the magnetic field B point into the paper. Based on the Lorentz force law, what is the critical speed v (the speed at which the horizontal electron beam is not deflected)? If the speed of the electron is greater than the critical speed, the trajectory of the elctron beam will be 1. deflected into the paper 2. deflected downward and out the paper 3. defledted out of the paper 4.deflected downward and into the paper 5. undeflected. or what else...

Explanation / Answer

E Q = electric force on electron (upward) Q v B = magnetic force on electron (downward) v = E / B

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