APFIVE Axial Magnetic Field of a Current Loop
A circular loop of wire with radius $$R$$ carries current $$I$$. At what distance $$z$$ along the axis perpendicular to the loop’s plane is the magnitude of the magnetic field half its value at the center of the loop?
A
$$z = R\sqrt{2^{2/3} - 1}$$
B
$$z = R/2$$
C
$$z = R$$
D
$$z = R/\sqrt{2}$$
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