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Physics 20 Online
OpenStudy (anonymous):

Which object is an insulator? A. iron B. copper C. plastic D. salt water

OpenStudy (anonymous):

can you help me o this? @Michele_Laino

OpenStudy (michele_laino):

I think plastic, since iron and copper are metals, so they are good conductors, furthermore also salt water is a good conductor, since it contains positive and negative ions

OpenStudy (anonymous):

youre right, thank you again! (: @Michele_Laino

OpenStudy (michele_laino):

:)

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