Question

One end of an aluminium wire, whose diameter
is 2.5 mm is welded to one end of a copper wire
whose diameter is 2.0 mm. The composite wire
carries a steady current 6.25 A. The current
densities in Al and Cu will be respectively
(1) 127 A/cm2, 200 A/cm2
(2) 126 A/cm2, 180 A/cm2
(3) 125 A/cm2, 160 A/cm2
(4) 125 A/cm2, 180 A/cm2​

Answer 1

Answer:

is 2.5 mm is welded to one end of a copper wire whose diameter is 2.0 mm. The composite wire carries a steady current 6.25 A. The current densities in Al and Cu will be respectively (A) 127 A/cm2, 200 A/cm2 (B) 126 A/cm2, ...

Explanation: