All Problems

Electric Capacitance, Energy of an Electric Field

Problem 3.108

Two long straight wires with equal cross-sectional radii aa are located parallel to each other in air. The distance between their axes equals b. Find the mutual capacitance of the wires per unit length under the condition bab \gg a.

Reveal Answer
Cπε0ln(b/a)C \approx \pi \varepsilon_{0} \ln (b / a)