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elpaco

Intrebare electromagnetism

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Posted

Am o bara de metal imi sta ca un ghimpe in coasta, busola imi arata in apropierea ei doua campuri magnetice la extremitati probabil N-S si nu e bine pentru fengsuiu meu polaritatea.

Cum pot inversa polaritatea barei de metal de la distanta fara sa o ating?

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