PHYSICS 1E03 Chapter Notes - Chapter 30: Unit Vector, Ampere, Solenoid
18 Apr 2017
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The vector db is perpendicular both to ds (which points in the direction of current) and to the unit vector r directed from ds toward p. The magnitude of db is inversely proportional to r2 where r is the distance from ds to p. The magnitude of db is proportional to the current i and to the magnitude ds of the length element ds. Biot-savart law only applies to the curved wire segment ac: the equation we are left with, the magnetic field is into the page at o. When a conductor carries a steady current of 1a, the quantity of charge that flows through a cross section of the conductor in 1s is 1c. Magnetic field created by a long current carrying wire: two options, r r o, r
