The j is usually written before a number because the j sign is a 90° operator.

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In engineering and physics, the letter "j" is used to represent the square root of -1, which is an imaginary unit. This notation is particularly common in electrical engineering and related fields to denote a 90° phase shift, as in the context of alternating current (AC) circuits, where it indicates a component that is orthogonal (90 degrees out of phase) to the real part.

The J Is Usually Written Before a Number Because the J