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(TV) OT: Tech Qs



1) If I hook up my home hi-fi (stereo) and run a ground wire from my amp (or
turntable!) to the little screw that is used to attach the cosmetic,
rectangular-plate to the wall-electrical outlet(s), will this ground my amp
(or turntable)?

Or is the answer no, and I need to shut-off all the power in my house, and
then remove the wall outlet receptacle-box and rewire my ground wire to the
ground wire inside the wall-outlet box inside the wall?

2) Independent of (1) above but related: 
If a piece of metal (e.g., a screw or little bolt) is attracted to a magnet
(e.g., refrigerator or 'toy'-magnet) can I conclude that this screw/bolt can
conduct electricity?
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