Question

Derivation for drift velocity for free electron and its relation with current i=neavd

Answer 1

Answer:

Explanation:

GDerivation for drift velocity for free electron and its relation with current i=neavd

Answer 2

Answer:

Drift velocity

$I=q/t=enAl/(l/vd)\\ I=neAvd$

Explanation:

• It is the average speed at which free electrons are pushed by an external electric field towards the positive end of a conductor (across from the electric field).
• The value of drift velocity of an electron is $10^{-1} m/s$.
• The current travelling into a conductor is equal to the electrons' drift velocity.
• Electric current was contribted by drift velocity.
• It is mainly dependend on the applied voltage

n=No.of electrons per unit volume

e= atom charge

l= No.of electrons in length of the conductor

= n×volume of conductor

=$nAl$

total charge contained in the conductor is

$q = neAl$

Electrons enters at right end of conductor and exit at left end of the conductor in time,

$t = distance/velocity\\=l/vd$

therefore,current,

$I=q/t=enAl/(l/vd)\\ I=neAvd$

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