Two spherical conductors A and B of radii a and b (b>a) are
placed concentrically in air. The two are connected by a
copper wire as shown in figure. Then the equivalent
capacitance of the system is
(a) 4πℰ₀ ab/b-a
(b) 4πℰ₀(a+b)
(c) 4πℰ₀b
(d) 4πℰ₀a
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