posted by Stacey on .
A length of wire has a radius of 3.00 x 10-3 m and a resistance of 0.200 ohms. When the potential
difference across the wire is 10.0 volts, the electron drift speed is found to be 2.98 x10-4 m/s. On the
basis of these data, calculate the density of free electrons in the wire.
J is the current density,
n is free electron density,
drift velocity v= 2.98•10⁻⁴ m/s
n= U/R•π•r²• e•v=...