Courses on Khan Academy are always 100% free. Start practicing—and saving your progress—now: nhttps://www.khanacademy.org/science/electrical-engineering/ee-circuit-analysis-topic/ee-ac-analysis/v/ee-multiplying-j-rotation
Multiplying any real or complex number by the imaginary unit j corresponds to a rotation. This is the key feature of j that makes it such a useful number.
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