Magnetism. Safety pins, which are made of steel, being attracted to a bar magnet. The magnetic field of the magnet induces a small magnetic field in the steel pins, and the opposite magnetic poles than attract each other. The pins will remain magnetised for a time after the bar magnet has been removed.
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Creative#:
TOP10163345
Source:
達志影像
Authorization Type:
RM
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須由TPG 完整授權
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