How Can Building an AC Electromagnet Affect Nearby Electrical Devices?

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Buzzlightyear
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Hi - I'm looking to build my own AC electromagnet for some personal science fun, however what I want to know is, at what point am I going to start interfering with the elctrical equipment in my house through the electric or magnetic (?) fields or worse start to affect my neighbours electrical applicances?? Many thanks
Mark
 
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For 50/60Hz magnetic fields, mostly you have to worry about messing up your TV screen and computer monitors, and messing up magnetic stripes on your credit cards.

If you are going to work with frequencies in the 100kHz+ type range, then you might start to interfere with AM radio reception.