Capacitance with Parallel Plate Condenser & Battery: Ans 3x

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rohit199622
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A parallel plate condenser is connected with the terminals of a battery. The distance between the plates is 6 mm. If a glass plate (dielectric constant K=9) of 4.5 mm is introduced between them, then the capacity will become
Ans 3 times how?
 
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This looks like a homework question.
Please post it in the right place.
PS try treating the system as two capacitors in series.