I just saw an instructor of EEE (YouTube) talk about Cross Product. He gave an example of when cross products are used. Here's what he said.(adsbygoogle = window.adsbygoogle || []).push({});

He drew a vertical arrow and said this is current. Then he drew a circular arrow around the vertical line and said it is B.

Then he drew a smaller vector, maybe unit, I'm not sure, on the vertical one and drew a vector from the base of the second vertical one to a point on the B arrow, stating that the cross product has something to do with these two vectors.

My question is since the current vector was not given a magnitude and neither was the B circle around the current arrow, how could one ever calculate the cross product.

AND since B technically goes on to infinity, at what diameter do you consider the end of the B vector to stop? If it's infinite, then I'd say the vector is infinite.

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# Cross Product and Magnetism

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