Let A be the vector potential and B the magnetic field of the infinite solenoid of radius R. Then ={} B(r) = A(r) = √x2 + y2 is the distance to the z-axis and B is a constant that depends on the current strength I and the spacing of where r = the turns of wire. The vector potential for B is if Bk if I.B. (R²B (-2,3,0) if r> R r

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