A solid sphere of radius $R_1$ and volume charge density $\rho  = \frac{{{\rho _0}}}{r}$ is enclosed by a hollow sphere of radius $R_2$ with negative surface charge density $\sigma $, such that the total charge in the system is zero. $\rho_0$ is a positive constant and $r$ is the distance from the centre of the sphere. The ratio $R_2/R_1$ is

  • A

    $\frac{\sigma }{{{\rho _0}}}$

  • B

    $\sqrt {\frac{{2\sigma }}{{{\rho _0}}}} $

  • C

    $\sqrt {\frac{{{\rho _0}}}{{2\sigma }}} $

  • D

    $\frac{{{\rho _0}}}{\sigma }$

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  • [JEE MAIN 2019]