A long straight wire of radius R carries a current density J = kr A/m² where k is a constant. The magnetic field for r R is (Hint: Current enclosed .) A) $\mu$₀kR³/3r B) 2 $\pi$$\mu$₀kR³/3r C) 2 $\pi$$\mu$₀kR²/r D) 2 $\pi$$\mu$₀kR/2 E) none of the above

Question

A long straight wire of radius R carries a current density J = kr A/m² where k is a constant. The magnetic field for r > R is (Hint: Current enclosed .) A) $\mu$₀kR³/3r B) 2 $\pi$$\mu$₀kR³/3r C) 2 $\pi$$\mu$₀kR²/r D) 2 $\pi$$\mu$₀kR/2 E) none of the above

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The Answer of A long straight wire of radius R carries a current density J = kr A/m² where k is a constant. The magnetic field for r > R is (Hint: Current enclosed .) A) $\mu$₀kR³/3r B) 2 $\pi$$\mu$₀kR³/3r C) 2 $\pi$$\mu$₀kR²/r D) 2 $\pi$$\mu$₀kR/2 E) none of the above

A Long Straight Wire of Radius R Carries a Current μ\muμ

A Long Straight Wire of Radius R Carries a Current $\mu$