Mahesh sir, I survived 12th onnnnnly becz of youu. I am a person who cannot move to another topic without understanding it till the roots and this was pretty difficult for me since i found no perfect explaination to why things were the way they are. Ever since i got a hand on your videos, life has been great. I smile as wide as i can at the end of each video. And the satisfaction that i get on understanding a concept is enormous. And i owe that all to youhh! Thankyou so much for making 12th interestinggg....So much love from chennai❤❤❤❤❤❤
Same....without understanding one topic I don't even feel like reading other things Ur my senior Ig..but it's nice to see some ppl like me I really love these concepts... it's just really fascinating and I have respect for ppl who found all these theories and also the great teachers who actually put effort in making us understand... Thank you khan academy! Btw, I wrote this under this reply since I relate to this...don't misunderstand.
I just started watching and I didn't realize how time went so fast which is obviously good. There is a saying right, when we have fun the time flies quickly. Yes, indeed it was very interesting and fun to watch this. I don't usually have fun studying but this is a rare case.
I learned that the electric field carries by far the greatest part of the energy. In a battery driven circuit, there's only a tiny fraction of electrons necessary to replenish those lost by the battery, resulting in very low drift speeds, a few centimeters per hour.
I GOT THIS ON MY CLASS 1OTH PHYSICS PRACTICE SHEET OF DRIFT VELOCITY AND IT BIT CONFILCTING INSIDE ME HOW THE FORMULA FORMS AND ALL AND THE TEacher just explains the question of it not the concept but sir you explained us so welll in a fun way and increases our way of thing and it all make sense now thank you very much for providing crash cource \
If the relaxation time is average ,,that means drift velocity is also average?? if drift velocity is average then also current shouldn't be average regarding I=nAVe ???
Hello.... Velocity is distance over time(d/t) .. But the equation you derived has a time parameter directly proportional... Can you please explain that in detail how did that happened....
Bro , gotchu . U see, velocity is distance / time, but also acceleration * time . Also the initial velocities all random , avg to zero , but the change in velocity due to acceleration is all in the same direction. Acceleration is along the direction of force of field
If sum of all initial velocities is zero, then sum of all final velocities at time t must be zero since they are in same direction(vector law) with initial velocity u. HOW DOES THE EQUATION WORK THEN??
the initial velocities all random , average to zero , but the change in velocity due to acceleration is all in the same direction. Acceleration is along the direction of force of field. Regarding your vector addition method , try two opposite initial velocity vectors. And add the same change in velocity vector due to same acceleration to both. Take their average, see that the result is true. The initial parts cancel by the assumption that all initial velocities point in random directions such that their avg is 0,
@@black_jack_meghav BHAI PAHLE CASE ME MOTION RANDOM HAI . TO SUM 0 AA RHA H KYUKI KOI EXTERNAL ACCLERATION NHI H SYSTEM ME PR 2ND CASE ME ACCLERATION AA GYA TO SARE ELECTRON DRIFT HONGE AUR EK TRF CHALENGE TO SUM KAISE 0 HOGA
hey, just have a small question. isn't the electric field is exerting acceleration at electrons at every moment in time period t? so how does relaxlion time T influence the drift velocity through all time T?
As we know since the average time between two collision is relaxation time which is the average of t hence it is substituted in the final equation in place of t average
Also regarding the intuition behind why increase in tau corresponds to increase in drift velocity... What if the average time between collision does increase, but the no. of collision itself decreases in such a way that the total time between collision decreases. Is such a scenario possible ?
average time increases and no of collisions also decrease . Then, summation of t/n will increase (denominator decreases and numerator increases) intuitively, it seems possible but when number of collisions decrease, it actually increases the average time.
Yess it is possible taking into consideration that the acceleration for such a situation will be less ie u+at is less which results in less chances of collison and longer duration of the electrons travelling freely accelerating without collisions Hope you would find it helpful
Why do you have to be so rude? Mind your own business. If he likes doing an American accent, let him. It's his choice. And you're nobody to comment on that. Please be nice. He's doing a fantastic job out there for all of us. So have some gratitude.
@@ishitabhattacharyya1538 so let me tell u something the video was in public domain and i have all the rights to comment whatever i want and who r you to tell me what to do . If i commented on his video he can reply me back if he wants to,he is not unsound mind and who r u. FYI it was just for fun
