Question

How do you derive ohm's law from the current density and electric field within a wire of uniform thickness???? Any hints??

Answer 1

If you have the electric field and the thickness of the wire, you should be able to dig out electric flux; use that and the current density to derive it.
HINT: You've got current...can you find resistance?
Note: I'm skipping a step or two in here intentionally, so you can figure the rest out.

Answer 2

we know, \[J=\sigma E\]\[where \sigma=\mu n e\]
now we knoe J=I/A, E=V/d
I/A=sigma*V/d
\[V=\frac{d}{A \sigma}I\]
\[\frac1{\sigma}=\rho\]
u get \[V=\rho\frac lA I\]that is our Ohm's law

Answer 3

good

Answer 4

good ans