steady current flows in a metallic conductor of non uniform cross section. the quantities which remain constant along the length of conductor.

I cudn't get your question.

are there any options in this question

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Rahul- IIT Roorkee

Dear Ajay,

It would have been nice if you posted the options as well but lets see. 

To begin with lets count the possibilities:

1. Current: yes, else there will be accumulation of charge in the cross-sections 
2. Current density: no, coz cross-section is changing
3. Drift Speed: No, coz I=neAv_d and as A increases vd must decrease to keep I constant
4. Electric Field: No, Is a vector and if the wire has non uniform cross-section then it can't remain in one direction
5. Electric Field Magnitude: No, coz vd is proportional to E and if vd is not constant then E can't be


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Gokul  Joshi

only current will remain const