Final answer:
AC interference on an EKG tracing is likely caused by electromagnetic induction when the EKG machine is not properly grounded. This interference can distort the EKG waveform and make it difficult to interpret the cardiac activity.
Step-by-step explanation:
AC interference on an EKG tracing is likely caused by electromagnetic induction. When the EKG machine is not properly grounded, it can pick up electrical interference from other devices or electrical sources in the environment, including AC power lines. This interference can distort the EKG waveform, making it difficult to accurately interpret the cardiac activity.
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