The conducting spherical shells shown in the figure are connected by a conductor. The capacitance of the system is

  • A
    $4\pi \varepsilon _0 \frac{ab}{b - a}$
  • B
    $4\pi \varepsilon _0 a$
  • C
    $4\pi \varepsilon _0 b$
  • D
    $4\pi \varepsilon _0 \frac{a^2}{b - a}$

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