Q.

Two identical parallel plate capacitors are joined in series to 100 V battery. Now a dielectric with K = 4 is introduced between the plates of second capacitor. The potential difference on capacitors are

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a

75 V, 25 V

b

80 V, 20 V

c

70 V, 30 V

d

60 V, 40 V

answer is D.

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Detailed Solution

C and 4C are in series 
C1 & C2 are in series Cs=4C5;Q=4C5×100
V1=QC=80V;V2=20V

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Two identical parallel plate capacitors are joined in series to 100 V battery. Now a dielectric with K = 4 is introduced between the plates of second capacitor. The potential difference on capacitors are