Negative pole of magnet deflects electrons?

  • Thread starter cnidocyte
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I watched a video there about cathode ray tubes and the guy in the video demonstrated the negative pole of a magnet deflecting the beam and the positive pole attracting the beam. I know that moving electrical charges create magnetic fields but I didn't know their magnetic fields always deflect negative magnetic poles. I'm having trouble visualizing this. Doesn't a moving electron have a positive and negative magnetic pole just like any other particle?
 

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  • #2
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Poles of magnets neither attract nor repel beams of moving electric charges. Magnets do deflect beams, but in a direction perpendicular to the magnetic field. The force on the beam is always perpendicular to the direction of motion, so the beam is bent into a circle.

So the force on the beam is perpendicular to both the magnetic field and the direction of motion.

I attach a thumbnail photo of an electron beam in a vacuum tube being bent into a circle by a pair of Helmholtz (magnetic solenoid) coils.

Bob S
 

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