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Q.

A capacitor is charged upto 0.4 J of energy with a battery and after disconnecting it from the battery the capacitor is completely filled with dielectric of dielectric constant 4, then final energy in the capacitor is  

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a

0.4 J  

b

0.1 J

c

0.2 J

d

0.3 J 

answer is D.

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Detailed Solution

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Ui=Q22C=0.4J⇒Uf=Q22KC=0.1J

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