A copper wire of length 1m and radius 1mm

Asked by admin @ 12/08/2021 in Science viewed by 310 People

a copper wire of length 1m and radius 1mm joined in series with iron wire of length 2m and 3mm and a current is passed through wire. what is the ratio of current density

Answered by admin @ 12/08/2021

Answer:

Current density, J=

where I= steady current and A= cross section of wire.

Here, J

πr

and J

πr

Thus,

=9:1

Explanation:

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