Question

A copper conductor of area of cross-section 40
mm2 on a side carries a constant current of
32 x 10-6 A. Then the current density in (in
amp/m 2)​

Answer 1

Answer:

Given :  A=3mm2=3×10−6 m2        I=5 A            ρ=8920 kg/m3

Number of free electron per unit volume  ne=MCuρNA

∴   ne=63.58920×6.023×1023=8.46×1025  electrons m−3

Drift velocity  vd=AneeI

∴  vd=3×10−6×8.46×1025×1.6×10−195=0.12 m/s

Explanation:

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Answer 2

Answer:

A copper conductor of area of cross section 40mm

A Copper Conductor of area of cross section 40mm square carries a constant current of 32×10^-6A

Explanation:

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