Question
Sun July 22, 2012 By:
 

a long straight wire along the z axis carries a current i in the negative z direction . the magnetic vector field b at a point having co ordinate(x,y) on the z=0 plane is ???

Expert Reply
Sun July 22, 2012
The magnetic field at a point on a plane z=0, perpendicular to the wire at a point A(x,y) is given as:
?I/2?r.
Its direction is perpendicular to the direction of current and its direction is determined by right and thumb rule
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