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A steady current flows in a metallic con...

A steady current flows in a metallic conductor of non-uniform cross-section i.e., `i` : constant. `A ne` constant.

A

`j = (i)/(A), j` vary with area of `X-section`

B

`j = sigma E`,
`(i)/(A) = sigma E rArr (i)/(sigma A) = E` `E` : changes with `A`

C

`j = n e v _d`
`(i)/(A) = n e v_d`
`v_d = (i)/(n e A), v_d` varies with `A`

D

All options are correct

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The correct Answer is:
D
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