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

question 15

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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