Is there an electric or magnetic field acting on this electron

[gvntr52]

the electron moves straight line through the space.Can we conclude there is no electric and magnetic field acts it? thanks for all answer

 

[Curious3141]

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 ?