Monday 1 January 2018

electromagnetism - How can length be a vector?


Length and current both are not vectors. Then how can we assign the vector $l$ to the length of a wire carrying current while calculating for a current carrying conductor in a magnetic field. Also why in Biot—Savart law do we take small length element $dl$ as a vector?


Why is length sometimes a vector, sometimes not, whereas current always is a scalar?




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