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How does electron mobility change when- 1- temperature of conductor is decreadecreased. 2- Applied potential difference is doubled at constant temperature ?

How does electron mobility change when- 1- temperature of conductor is decreadecreased. 2- Applied potential difference is doubled at constant temperature ?

Grade:12

4 Answers

Nicho priyatham
625 Points
5 years ago
1)wn temp is increased resistance is increaded so current decreases end electron mobality decreases
2)wn pd is doubled curent increases and electron mobility increases
PLZ APPROVE if useful and ask if any further doubts
Adarsh
733 Points
5 years ago
The second part of the answer is incorrect.
Khushal Mehta
26 Points
3 years ago
1. when the temperature is decreased the relaxation time increases.
As the mobility of electron is directly proportional to the relaxation time so the mobility also increases.

2.The potential difference is inversely proportional to the mobility.So If the potential difference is doubled then mobility gets half. 
Kushagra Madhukar
askIITians Faculty 629 Points
9 months ago
Dear student,
Please find the answer to your question.
 
We know, mobility of electrons(u) = eT/m
Where T is the relaxation time, e is electronic charge and m is mass of electron.
  1. Now, when Temperature is decreased, the relaxation time being inversely proportional to it increases. Therefore, the mobility also increases.
  1. Now, the mobility of electrons is independent of the potential difference. Hence the mobility remains unchanged when potential difference is doubled.
Thanks and regards,
Kushagra

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