# Magnetic and electric field between current carrying coaxial cables

by disillusion
Tags: cables, carrying, coaxial, current, electric, field, magnetic
 P: 7 1. The problem statement, all variables and given/known data Two long concentric, cylindrical conductors of radii a and b (a>r Following from above Capacitance $$C=\frac{2\pi\epsilon_{0}}{log_{e}(\frac{b}{a})}$$ per unit length so using Q=CV, get $$E=\frac{V}{r log_{e}(\frac{b}{a})}$$ now force F=q(E+u^B) so $$|\textbf{u}|=\frac{|\textbf{E}|}{|\textbf{B}|}$$ and so $$|\textbf{u}|=\frac{2\pi V}{\mu_{0}I log_{e}(\frac{b}{a})}$$ would this look right?
HW Helper
P: 5,346
 Should I just treat the potential difference as a separate E field along the radial direction?
I would think so.

The result looks OK.

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