Review - continued
Basic equation for calculating magnetic fields:
B = (mo/4p) I DL sin(qIr) / r2
with direction: thumb(field) = hand(current) x fingers(radius).
UNITS: Note all equations for B should have a mo, an I, and a (distance/distance2) or (1/distance).
Bat center of loop = mo N I / 2R
Bhelmholtz coil = 8?oNI/[125]1/2 R
Blong straight wire = mo I / 2?a