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

question 19

Multiple Choice

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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