$A$ spherical capacitor consists of two concentric spherical conductors. Find the capacitance of the spherical capacitor if the outer radius is $2 R$ and the inner radius is $R$.

  • A
    $4 \pi \varepsilon_0 R$
  • B
    $8 \pi \varepsilon_0 R$
  • C
    $\frac{8 \pi \varepsilon_0}{R}$
  • D
    $\frac{4 \pi \varepsilon_0}{R}$

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