Electrical Engineering > GATE 2025 > Capacitance
An air filled cylindrical capacitor (capacitance C0) of length L, with a and b as its inner and outer radii, respectively, consists of two coaxial conducting surfaces. Its cross-sectional view is shown in Fig. (i). In order to increase the capacitance, a dielectric material of relative permittivity εr is inserted inside 50% of the annular region as shown in Fig. (ii). The value of εr for which the capacitance of the capacitor in Fig. (ii), becomes 5C0 is
Correct : c
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