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(c) In Optical fiber cables electromagnetic Interference is a common noise that originates with the basic properties of electromagnetism. Magnetic field lines generate an electrical current as they cut across conductors. The flow of electrons in a conductor generates a magnetic field that changes with the current flow. since current does cut across the conductor. Fiber optics are subject to electromagnetism since signals are transmitted as light instead of current.As Fluctuations in the induced magnetic field outside a conductor carry the same information as the current passing through the conductor so optical fiber cables are not subject to electromagnetic interference from outside.