Question

Composite capacitance consists of _________

(a) one dielectric medium

(b) more than one dielectric medium

(c) five dielectric media

(d) ten dielectric media

The question was posed to me in final exam.

This interesting question is from Capacitive Transducer topic in division Transducers of Electrical Measurements

Answer 1

Right answer is (b) more than one dielectric medium

The explanation is: In a composite capacitance, there is more than one dielectric medium. The capacitance is given by

where, d1, d2 and d3 are the thicknesses

             ∈1, ∈2  and ∈3 are the permittivities of the three different media.