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Q.

Three plates A, B and C each of area 50cm2 have separation 3mm between A and B and 3 mm between B and C. The plates A and B are connected to a battery of 12 V . The energy stored when the plates are fully charged is 

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a

2.1×10−9J

b

7×10−9J

c

5×10−9J

d

1.6×10−9J

answer is B.

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Detailed Solution

There are two capacitors parallel to each other
Total Capacitancee=2ε0Ad
Energy Stored =122ε0AdV2

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