What is the magnetic field at a point on the axis of a circular loop of radius R carrying a current I at a distance x from the center?
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(μ₀I)/(2R) * (R²/(R²+x²)^(3/2))
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(μ₀I)/(4R) * (R²/(R²+x²)^(3/2))
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(μ₀I)/(2R) * (1/(R²+x²)^(3/2))
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(μ₀I)/(4R) * (1/(R²+x²)^(3/2))