Question

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​

Answer 1

Answer:

Current density, J=

A

I

​

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

Here, J

1

​

=

A

1

​

I

​

=

πr

1

2

​

I

​

and J

2

​

=

A

2

​

I

​

=

πr

2

2

​

I

​

Thus,

J

2

​

J

1

​

​

=

r

1

2

​

r

2

2

​

​

=

1

2

3

2

​

=9:1

Explanation:

Answer 2

Answer:

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