Answer :

Lets re-draw the diagram-

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

C =


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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