The spheres shown in the figure are connected by a conductor. The capacitance of the system is (...

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The spheres shown in the figure are connected by a conductor. The capacitance of the system is
(a) \( 4 \pi \varepsilon_{0}\left(\frac{a b}{b-a}\right) \)
(b) \( 4 \pi \varepsilon_{0} a \)
(c) \( 4 \pi \varepsilon_{0} b \)
(d) \( 4 \pi \varepsilon_{0}\left(\frac{a^{2}}{b-a}\right) \)
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