Physics 43 Magnetic Forces on Moving Charges (17 of 26) Thompson's e/m Ratio

In this video I will explain and calculates the Thompson's e/m ratio. (electron/mass ratio)

[ekanshwadhwa]

So, I had a question.
If the Left Hand Fleming Rule demands us to point the middle finger in the direction of CURRENT, shouldn't it be in the opposite direction of electron's motion in this case?

This provides us with motion of the rays in the same direction as the current.

[tharvinchandran]

Sir, where did you get the values for Electric Field, the potential difference & magnetic field all in order to get 1.759×10^11?

[zoraiznaeem]

I have a doubt in the calculations you are neglecting the initial KE of electrons when they were launched /released from the cathode. Is this done to make the problem calculations easier or the effect is too small?

[mildredmusic]

thank you so much! after a few articles and two videos, this one has been the most helpful.

[Wosjb]

Are there any practical uses for e/m ratio?

[frankcoyne]

understood every thing except are we talking about the Thomson effect