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What is the tendency of parallel beam of...

What is the tendency of parallel beam of electron moving uniformly in vaccuum with (i) normal speed (ii) with high speed.

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A parallel beam of electrons has electrons moving parallel to each other and a moving electron produces electric current and hence a magnetic field. (i) When electrons are moving with the normal speed, then the electrostatic repulsion between electrons dominates the magnetic attraction between them. Due to it, the electron beam becomes diverging beam. (ii) When electrons are moving with high speed, then the magnetic attraction between them dominates the electrostatic repulsion between them. Due to it, the electron beam becomes converging beam.
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