Posted by Stacey on Monday, November 19, 2012 at 2:31pm.
A length of wire has a radius of 3.00 x 103 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 x104 m/s. On the
basis of these data, calculate the density of free electrons in the wire.

physics, university  Elena, Monday, November 19, 2012 at 3:12pm
J=nev,
where
J is the current density,
n is free electron density,
e=1.6•10⁻¹⁹C ,
drift velocity v= 2.98•10⁻⁴ m/s
J=U/RA,
where
U=10 V,
R=0.2 Ω,
A= πr²
n•e•v= U/R•π•r²
n= U/R•π•r²• e•v=...
Answer This Question
Related Questions
 university, physics.  A length of wire has a radius of 3.00 ~ 103 m and a ...
 physics  A length of wire has a radius of 3.00 ~ 103 m and a resistance of 0....
 Physics. Free electron density, please help!  A length of wire has a radius of ...
 physics, university  A 50.0g sample of a conducting material is all that is ...
 physics  A wire has a resistance of 27.2 ohms. It is melted down, and from the ...
 AP Physics  A certain length of wire has a resistance of 21 ohms. This wire is ...
 Physics  Calculate the resistance per unit length of a nichrome wire, which ...
 physics  A potential difference of 2.0 V is applied across a wire of cross ...
 Physics   Q.1. Two wires each of length 40 m and diameter 2.6 mm, are ...
 physics  You apply a potential difference of 5.00 V between the ends of a wire ...
More Related Questions