Figure 26-35 A parallel-plate capacitor of plate area A is filled with two diele

Question

Figure 26-35

A parallel-plate capacitor of plate area A is filled with two dielectrics as in Figure 26-35a. If A = 1.28 m2, k1 = 273.4, k2 = 196.4, and d = 0.013 m, what is the capacitance?

F   

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Figure 26-35

A parallel-plate capacitor of plate area A is filled with two dielectrics as in Figure 26-35b. If A = 0.99 m2, k1 = 147.9, k2 = 42.3, and d = 0.006 m, what is the capacitance?

F   

Explanation / Answer

a)Ceff=C1+C2=k1e0A/2d+k2e0A/2d=8.85*10^-12*1.28/2/0.013*(273.4+196.4)=2.047*10^-7F

b)Ceff=C!*C2/(C1+C2)=(2*8.85*10^-12*0.99/0.006)^2*147.9*42.3/(2*8.85*10^-12*0.99/0.006*(147.9+42.3))

=9.6*10^-8F

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