Explanation:

Uniformly Charged Line Potential:
- The potential of a uniformly charged line with density λ is given by V = λ/(2πε) ln(b/a), where ε is the permittivity of the medium, a is the inner radius, and b is the outer radius of the charged line.

True Statement:
- The statement given in the question, λ/(2πε) ln(b/a), is true.

Explanation:
- The potential of a uniformly charged line is directly proportional to the charge density λ and the natural logarithm of the ratio of the outer radius (b) to the inner radius (a). This relationship is derived from the formula for the potential of a charged line.

Mathematical Interpretation:
- The expression λ/(2πε) ln(b/a) represents the potential at a point outside the charged line due to the distribution of charge along the line. The natural logarithm term accounts for the variation in potential with distance from the line.

Significance of the Result:
- Understanding the potential of a uniformly charged line is crucial in analyzing the electric field and energy distribution in systems involving line charges. This result provides a quantitative measure of the potential at different points around the charged line.

Application in Electrical Engineering:
- In electrical engineering, the concept of potential due to line charges is utilized in the design and analysis of transmission lines, antennas, and other systems involving linear charge distributions. The potential calculation helps engineers optimize the performance and efficiency of electrical systems.

Conclusion:
- The expression for the potential of a uniformly charged line, λ/(2πε) ln(b/a), is a fundamental result in electrostatics that finds widespread application in electrical engineering and related fields. Understanding this relationship is essential for solving problems involving line charges and electric potentials.