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gruba
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Homework Statement
Wire conductor of length l consists of two part with equal length in series, and of specific conductivity σ1 and σ2. When conductor is connected to constant voltage U, what are electric fields in parts of this conductor?
Homework Equations
[tex]J=σE[/tex]
The Attempt at a Solution
Electric fields should be [tex]E_1=\frac{2σ_2U}{l(σ_1+σ_2)}[/tex]
[tex]E_2=\frac{2σ_1U}{l(σ_1+σ_2)}[/tex]
I don't know how to derive these equations.
Could someone give a hint?
Thanks for replies.