Question

4) A cylindrical copper cable carries a current of 1200 A. There is a potential difference
of 16 mv between the two points on the cable that are 24 cm apart. The number of
carriers per unit volume of the current in the wire is 28 6.95 x 10^28th power .
a) Find the radius of the cable
b) Find the average current density in the cable
c) What is the drift velocity of the current ?

Could this be explained (with any formulas used explained), I have a trouble time understanding the previous posts to this question. (A diagram would be very helpful) Much will be appreciated, thanks!

Answer 1

+ 7 I 3.96xlo A la 4 (a) Resistance R = V 16xlo = 1.33x105 r 1200 Resistivity of copper 8 = 1.68x102m R= 8l A = 1.68x1080.24 1.33x105 cross section area A=0.303x103 m² A=Tr² = 0.303x103 0.9825 x16? current density J= 1200 0.3.3x153 (0) 6 J drift speed 3-96xlo 6.95x128x1-6x15 v = 0.356 x 103 mis - Ja neva