Two parallel plate capacitors 
and 
each having capacitance of 
are individually charged by a 100 V D.C. source. Capacitor 
is kept connected to the source and a dielectric slab is inserted between it plates. Capacitor 
is disconnected from the source and then a dielectric slab is inserted in it. Afterwards the capacitor 
is also disconnected from the source and the two capacitors are finally connected in parallel combination. The common potential of the combination will be 
. (Assuming Dielectric constant 
)
Text Solution
Verified by Experts55
(55)
(1) 
(2) 
(3) 
By charge conservation
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