Physics 2 Quiz
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MAGNETISM
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A long straight wire of circular cross-section has radius RR and carries a total current II with a non-uniform current density J(r)=J0rRJ(r) = J_0 \frac{r}{R}, where rr is the distance from the wire's axis. Which expression correctly gives the magnetic field at a point outside the wire at distance r>Rr > R from the axis?
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