'Thin straight wire' diaporamas de présentation

ds is an infinitesimal quantity in the direction of dx, so

Example: calculate the magnetic field at point P due to a thin straight wire of length L carrying a current I. (P is on the perpendicular bisector of the wire at distance a.). y. P. ?. dB. ?. r. a. ?. x. ?. z. ds. I. x. L. ds is an infinitesimal quantity in the direction of dx, so.

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