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← ScienceWhich risk increases when a pulsed electromagnetic field (PEMF) device exceeds maximum duty cycle?
A)Phase velocity becomes superluminal
B)Excessive eddy current heating✓
C)Dielectric material cold welding
D)Spontaneous emission rate quenching
💡 Explanation
Reaching maxium duty cycle induces excessive current, causing eddy current heating because the magnetic field increases rapidly. Therefore device overheating is plausible; rather than exceeding phase velocity because duty cycle primarily addresses the exposure duration and intensity, not relativistic changes.
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