Final answer:
Coaxial cables are resistant to EMI due to their design, which includes two conductors separated by an insulator. They are widely used for reliable transmission of signals in TV and internet connections. Although EMI is a concern, studies have not conclusively linked non-ionizing radiation from power lines to an increased risk of cancer.
Step-by-step explanation:
Coaxial cables are vulnerable to EMI (electromagnetic interference). These cables are designed to transmit electrical signals with minimal distortion due to their construction, which includes two long cylindrical conductors. A characteristic of coaxial cables is their ability to resist interference, making them suitable for applications like cable TV connections and audiovisual connections, where preserving signal integrity is important. The inner conductor and outer concentric conductor are normally separated by an insulator, such as polyethylene plastic, that minimizes radial leakage current and helps to shield the cable from electromagnetic interference from external sources.
However, despite the advantages of coaxial cables in reducing EMI, there are scenarios where electromagnetic fields (E-fields) generate concern, such as the proximity to power transmission lines. While some people worry about health risks like cancer related to exposure to E-fields, scientific studies have generally found no increase in cancer risk from non-ionizing radiation produced by these power lines. The controversies surrounding E-fields often involve demographic and epidemiological data that have yet to conclusively support the hazard theory.