Question

Electromagnetic interference is often generated by:

a. Motors
b. Fluorescent lights
c. Power lines
d. All of the above

Answer 1

Electromagnetic interference can be generated by motors, fluorescent lights, and power lines. All these sources emit electromagnetic fields that can cause interference, hence the correct answer is 'All of the above'.

Step-by-step explanation:

Electromagnetic interference (EMI) can be generated by various sources that emit electromagnetic fields (E-fields). The options provided include several known sources of EMI:

• Motors which contain loops of wire in a magnetic field. When current passes through these loops, a magnetic field exerts a force on them, leading to the generation of electromagnetic fields.
• Fluorescent lights, which contain gases that emit radiation when excited by an electric current, can also generate electromagnetic fields.
• Power lines transmit high voltage and the transmission generates electromagnetic fields. There are concerns about the potential health hazards from these E-fields, although they are non-ionizing radiation.

Considering the sources listed and their mechanisms of operation, we can conclude that the correct answer is d. All of the above.