Answer to Question #213890 in Physics for mkhm

Question

By applying the point for of OHM’s Law to a cylindrical conductor derive the expression V=IR . Assume that J and E are uniform. 

Answer 1

$$V=El\\J=\sigma\frac{V}{l}\\\frac{I}{A}=\sigma\frac{V}{l}\\V=I\frac{l}{\sigma A}\\V=IR$$