Which of the following can be a source of Electromagnetic Interference (EMI)?

Electrical power cables are indeed a significant source of Electromagnetic Interference (EMI). This is due to the alternating current (AC) that flows through power cables, which generates electromagnetic fields. These fields can induce currents in nearby conductors, potentially disrupting the operation of sensitive electronic equipment and communication signaling.

While other types of cables, like coaxial and twisted pair cables, are designed to mitigate EMI effects, they do not inherently create as much interference as electrical power cables. Fiber optic cables, on the other hand, use light to transmit data and are immune to EMI altogether. Therefore, when considering sources of EMI, electrical power cables stand out as a prominent contributor due to their high current and voltage levels, making them a critical factor in network design and implementation for minimizing interference issues.