Answer :

Lets re-draw the diagram-


We know, capacitance for a spherical capacitance c is given by-


C =



Where,


C: Capacitance


ri: inner radius


ro: outer radius


k: relative permittivity


: permittivity of space


Capacitance between c and a-



Similarly, between b and c



From fig, we can see that the two capacitors are connected in series, hence the net capacitance is given by-






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