Answer to Question #61338 in Electricity and Magnetism for muhammad umar

Question

5) A 0.40 mm diameter copper wire carries a current of
3μA
. Find the current density in the wire

a) 15.16A/m2

b) 33.32A/m2

c) 26.17A/m2

d) 23.87A/m2

6) Calculate the resistance of 180 m of silver wire having a cross section of
0.33mm2
. The resistivity of silver is
1.6×10−8Ωm

a) 11.2Ω

b) 9.6Ω

c) 14.6Ω

d) 7.5Ω