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Using the electric field would pose a health risk, and would be better employed in applications in which people aren't nearby, he says. Conversely, using the magnetic field would be much safer and could be implemented just as easily. "I can't think of any reason to worry [about health concerns]," he says, "but people will."As technology improvement, everything are getting handy, but doesn't mean people are getting healthy. Got to make some search how electric field and magnetic field affect to people health.