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Redistribution of charges and concept of common potential

Question

Three plates A, B and C each of area 0.1 m2 are separated by 0.885 mm from each other as shown in the figure. A 10 V battery is used to charge the system. Find the energy stored in the system (in μJ). 

Moderate
Solution

Making equivalent circuit diagram.

The energy stored in the system

U=12C1V2+12C2V2=12C1+C2V2

U=128.85×1012×0.10.885×103×2×102=0.1 μJ



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