Question: Q. 3. A parallel plate capacitor of capacitance C is charged to a potential V. It is then connected to another uncharged capacitor having the same capacitance. Find out the ratio of the energy stored in the combined system to that of stored initially in the single capacitor.

A [O.D. I, II, III 2014]

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Solution:

Ans. Energy stored in a capacitor

U=12CV2 or 12q2C1/2

Capacitance of the (parallel) combination

=C+C=2C

Here, the total charge, Q, remains the same :

Initial energy =12q2C and Final energy =12q22C

Ratio of energies = final energy  initial energy 

=14q2C12q2C =24=12

[CBSE Marking Scheme 2014]



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