$\begin {array} {1 1} (A)\;\large\frac{\rho I}{8\pi r^2} & \quad (B)\;\large\frac{\rho I}{ r^2} \\ (C)\;\large\frac{\rho I}{2\pi r^2} & \quad (D)\;\large\frac{\rho I}{4\pi r^2} \end {array}$

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