Question

define mobility and relaxation time?​

Answer 1

Answer:

relaxation time

Explanation:

Relaxation time is the time interval between two successive collisions of electrons in a conductor, when current flows.

I=currentI=current

nn = no. of free electrons

aa=area of conductor

vv=drift velocity

ee=charge of electron

v=(e\dfrac {E}{m})T v=(e

m

E

)T EE= field m m=mass of electron TT= Relaxation time

From this, you can find expression of relaxation time

T=v\dfrac {m}{e}ET=v

e

m

E

Field is \dfrac{ V}{L}

L

V

L=Length and V=IR.V=IR.

From this you can modify the expression in terms of resistivity.