does the drift velocity vary with the magnitude of current through the conductor? explain
Answers
Answer:
Relation between drift velocity (Vd) and current density(J).
Considered a current carrying conductor of length (l) and area of cross section (A). The free electron density of this conductor be “n” electrons/metre³.
when a potential difference V voltage applied across its end then the electric field E is produced and free electron are move in the direction opposite to the electric field by the drift velocity.
“Drift velocity”: Drift velocity is define as the average velocity with which the electrons get drifted towords positive end of the conductor under the influence of an external electric field. it is denoted by Vd.
Thus, Vd = l/t = (U+V)/2
The Free electron density of a conductor be “n” electrons/metre ³.
i.e 1m³ volume containing = n free electron
Hence,
(AL) m³ Volume containing (N) = n.(AL) electrons
Thus, amount of charge flows through any cross section of a conductor,Q = N.e