### Capacitance

A parallel plate capacitor is filled with two dielectrics as in Fig. 30-38. Show
that the capacitance is given by *C* = (2e_{o}*A*/*d*)[(k_{e1}k_{e2})/(k_{e1}+k_{e2})].
Check this formula for all limiting cases of the values of the two dielectric
constants k_{e1}
and k_{e2}.