2. Drift Velocity of Electrons | Current Electricity | 12th Physics

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[@trsomas]

The formula is correct but the method of derivation is wrong.
1) You have taken drift velocity as the velocity just before next collision. But this approach is wrong because drift velocity is average velocity of free electrons at any moment (and not only just before collision).
2) Not all free electrons collide with ions at the same time. So, if you take average of velocities just before collision, then you are finding velocities at different time instants and then taking their average. This is a wrong approach. You have to take average of velocities of all free electrons at the same instant.

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[@CSChampions569]

Sir vd drift velocity ka doubt hai vd =(eE/m)T or (eE/2m)T from video of float head physics channel mahesh sir

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[@AmanElrod]

Sir what's the correct formula of drift velocity Vd= -eET/m or Vd= eET/m

[@REAO55]

1st is correct

[@amirrai4096]

Both the equations are true but prefer writing Vd=-eEτ/m. The negative sign means that the direction of drift velocity of electron is opposite to the direction of the applied electric field
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