A steady current is flowing in a cylindrical conductor. Is there any electric field within the conductor ? If yes, what is its relation with current density?
Text Solution
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Yes, the current flows through a conductor only when the electric field established within the conductor exerts force on the free electrons, due to which they move in a definite direction, accounting for current in the coductor. The electrical field E inside the conductor is given by `E = ("potential difference")/("length") = V/l = (IR)/(l) = I/l (rho l)/(A)= rho J` `(because (I)/(A)=J)`
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