Why does a ball hanging on a silk thread, attracted to an electrified object, immediately after touching it begin to repel from it

Why does a ball hanging on a silk thread, attracted to an electrified object, immediately after touching it begin to repel from it, and with the same ball suspended on a thin metal wire, this phenomenon is not observed?

Because the charges in the first case become of the same name, in the second the copper wire prevents this

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