A flat ciruclar loop with radius r situation on the xy, Ask an Expert

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A flat ciruclar loop with radius R situation on the (x,y) plane centered at the origin has a magnetic field at a point z above the origin.

At what value of z (expressed in terms of R) is the ratio of the magnitudes of a flat cirular loop (the exact ratio using biot savart law and the appoximate using the dipole formula) equal to 0.95??

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