Consider the case of a non-homogeneous solid cylinder of radius R carrying a current 'I' such that the current density depends on the radial distance 'r' from the axis of the cylinder as J = σr, (σ is constant). The magnetic field at a point 'P' at a perpendicular distance r(< R) from the axis of the cylinder is-
1
\(\frac{{{\mu _0}I{R^2}}}{{2\pi {r^3}}}\)
2
\(\frac{{{\mu _0}I{r^2}}}{{2\pi {R^3}}}\)
3
\(\frac{{{\mu _0}I{r^2}}}{{2\pi {R^2}}}\)
4
\(\frac{{{\mu _0}I{R}}}{{2\pi {r^2}}}\)
5
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