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557

Centuries: 5th century - 6th century - 7th century

Decades: 490s - 500s - 510s - 520s - 530s - 540s - 550s - 560s - 570s - 580s - 590s

Years: 552 553 554 555 556 557 558 559 560 561 562


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Van de Graaff generator

... the air at that point, repelling positive charges onto the belt and they are carried up inside the sphere. This positive charge induces a negative charge to the electrode ...