Q. 24.0( 66 Votes )

How does the mobility of electrons in a conductor change, if the potential difference applied across the conductor is doubled, keeping the length and temperature of the conductor constant ?

Answer :

If the drift velocity of the electrons is . Then, the mobility is

where is the electric field strength.

Also, if the electron density is , area of cross section is A, then


Combining all, we get


where is the length of conductor.


Hence, mobility is independent of the voltage applied. Thus it remains same.

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