Equation of capacitance for a co-axial cable capacitor

Q.  If the medium is different than air, then what would be the equation of capacitance for a co-axial cable capacitor?
- Published on 05 Oct 15

a. C = ε0 εr A / d
b. C = 4π ε0 εr [ab / a - b]
c. C = 2π ε0 εr L / ln (b/a)
d. C = 2π ε0 εr R

ANSWER: C = 2π ε0 εr L / ln (b/a)

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