What is the primary function of the shielding in coaxial cable?

The primary function of the shielding in coaxial cable is to prevent signal interference. The design of coaxial cable includes a central core conductor, surrounded by an insulating layer, followed by a conductive shield, and then an outer insulating layer. The shielding plays a crucial role in maintaining the integrity of the transmitted signals by blocking external electromagnetic interference (EMI) and radio frequency interference (RFI). This is particularly important in data transmission, where signal clarity is essential for effective communication, as any unwanted interference can degrade the quality of the signal and lead to data loss.

The other choices, such as enhancing flexibility or providing electrical insulation, relate to other components or characteristics of the coaxial cable rather than the specific purpose of the shielding. Additionally, while shielding can protect against physical damage to some extent, its primary role is as a barrier to interference, ensuring that the inner signal conductor operates optimally without disruption from external sources.