Condenser A has a capacity of \( 15 \mu \mathrm{F} \) when it is filled with a medium of dielect...

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Condenser A has a capacity of \( 15 \mu \mathrm{F} \) when it is filled with a medium of dielectric constant 15 . Another condenser B has a capacity \( 1 \mu \mathrm{F} \) with air between the plates. Both are charged separately by a battery
P of \( 100 \mathrm{~V} \). After charging, both are connected in parallel without the battery and the dielectric material

W being removed. The common potential now is
(A) \( 400 \mathrm{~V} \)
(B) \( 800 \mathrm{~V} \)
(C) \( 1200 \mathrm{~V} \)
(D) \( 1600 \mathrm{~V} \)
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