$A$ solid conducting sphere of radius $R_1$ is surrounded by a hollow conducting sphere of radius $R_2$. The capacitance of this assembly is proportional to ........

  • A
    $\frac{R_2 - R_1}{R_1 R_2}$
  • B
    $\frac{R_2 + R_1}{R_1 R_2}$
  • C
    $\frac{R_1 R_2}{R_1 + R_2}$
  • D
    $\frac{R_1 R_2}{R_2 - R_1}$

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