Two capacitors of unknown capacitances 
and 
are connected first in series and then in parallel across a battery of 100 V. If the energy stored in the two combinations is 0.045 J and 0.25 J respectively, determine the value of 
and
. Also calculate the charge on each capacitor in parallel combination.
When the capacitors are connected in parallel.
Equivalent capacitance, 
The energy stored in the combination of the capacitors,
------ (i)
When the capacitors are connected in series.
Equivalent capacitance 
The energy stored in the combination of the capacitors,
From equation (i)
-------------- (ii)
Solving (i) and (ii), we get;
When capacitors are connected in parallel, the charge on each of them can be obtained as follows:
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