Write an expression for b⃗ (d), the magnetic field a distance d above the xy plane of the sheet. use μ0 for the permeability of free space. express the magnetic field as a vector in terms of any or all of the following: d, i, n, a, μ0, and the unit vectors i^, j^, and/or k^.

the tires are rotating at 0.434 rpmlinear speed=45 m/sdiameter=0.550 mradius=0.275 mnow v= rωω= v/rω=45/0.275ω=163.6 rad/sω=163.6 rad/s (1rev/2π rad) (60s/1m)ω=1563 rpm

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