10. An infinitely large, thin conducting sheet carries a uniform current density J. What is the magnetic field at a distance r perpendicular to the surface of the sheet?
(A) 1/2 μ₀ J
(B) 1/2 μ₀ Jr
(C) μ₀ J
(D) μ₀ Jr
(E) 1/2 μ₀ J²

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