Question

Figure given shows two identical parallel plate capacitors connected to a battery with switch S closed. The switch is now opened and the free space between the plate of capacitors is filled with a dielectric of dielectric constant . What will be the ratio of total electrostatic energy stored in both capacitors before and after the introduction of the dielectric?

678419
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A

B

C

D

Hard

Solution

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Correct option is C)

When switch (S) is closed,

Charge on B,Q=CV
When switch(S) is open and dielectric is inserted in both capacitors, potential of A remains same while charge on B remains same.



.

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