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Curent Electricity Doubt PLEASE HELP 
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#1
Sep209, 03:13 AM

P: 10

1. The problem statement, all variables and given/known data
I did not understand one thing.. If it is given that a wire has a current 'i', then why do we say (in applications of laws such as biot savart law) that the current in a small element of the wire is also 'i', that is the same current that passes through the whole conductor. 2. Relevant equations can someone explain this. i got really confused on this one. 3. The attempt at a solution I thought we should take curent in the ' dl ' element of the wire as ' di ' and not i. I am wrong. Please Explain, anyone! 


#2
Sep209, 04:34 AM

P: 836

Current is [tex]\frac{dQ}{dt}[/tex], the amount of charge which passes through a crosssection of the wire per unit time. This value does not depend on the lenght segment of wire.
Also, for one segment of wire to have a different current than another causes a buildup of charge, inconsistent with Kirchhoff's junction rule. 


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