The number density of free electrons in a copper conductor is estimated at `8.5 xx 10^(28) m^(-3)`.
Channel: Doubtnut
Date: 2020-08-23

The number density of free electrons in a copper conductor is estimated at `8.5 xx 10^(28) m^(-3)`. How long does an electron take to drift from one end of a wire 3.0 m long to its other end? The area of cross-section of the wire is `2.0 xx 10^(-6)m^(2)` and it is carrying a current of 3.0A.