A cikin electromagnetism, adadin wutar lantarki da ke ratsa kowane ɓangaren madubi a kowane lokaci ana kiransa ƙarfin halin yanzu, ko kuma kawai wutar lantarki. Alamar halin yanzu ita ce I, kuma naúrar ita ce ampere (A), ko kuma kawai “A” (André-Marie Ampère, 1775-1836, Faransanci phys...
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