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Electrostatic Potential And Capacitance

Question
CBSEENPH12037389

Two dielectric slabs of dielectric constants k1 and k2 are filled in between the two plates, each of area A, of the parallel plate capacitor as shown in the figure. Find the net capacitance of the capacitor.

Solution
Capacitance when dielectric is introduced in between the capacitors is given by C=KεAd

The arrangement shown in the figure is equivalent to a parallel combination of two capacitors, each with plate area A/2 and separation between the plates as d.
Thus,  the net capacitance is given by

   C = C1+C2
     
     = ε0(A/2)k1d+ε0(A/2)k2d= ε0A(k1+k2)2d

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