Is there an electric or magnetic field acting on this electron

AI Thread Summary
An electron moving in a straight line suggests that no net electric or magnetic field is acting on it, but this conclusion depends on the constancy of its speed. If an electric field is applied in the direction of or opposite to the electron's movement, it will affect the electron's speed and potentially its direction. Similarly, introducing a magnetic field aligned with or against the electron's trajectory will alter its direction without changing its speed. The discussion emphasizes the importance of understanding how external fields influence an electron's motion. Overall, the presence of electric or magnetic fields can significantly impact the behavior of an electron.
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the electron moves straight line through the space.Can we conclude there is no electric and magnetic field acts it? thanks for all answer
 
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Moving in a straight line - no mention of speed and whether it remains constant. This is a big hint.

What happens when an electric field oriented along or directly opposite to the direction of movement is applied ? What happens to the direction of the electron's motion ? What happens to the speed of the electron ?

What happens when a magnetic field oriented along or opposite to the direction of electron movement is applied ? Does the direction change ? Does the speed ?
 

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