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Energy of a Capacitor

7.how will th...

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7.how will the (i) energy stored in the capacitor (ii) the electric field inside the capacitor be affected when it is completely filled with a dielectric material of dielectric constant 'K'?

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Q. Deduce the expression for the electrostatic energy stored in a capacitor of capacitance

^{'} C^{'}

and having charge

^{'} Q^{'}

.
How will the (i) energy stored and (ii) the electric field inside the capacitor be affected when it is completely filled with a dielectric material of dielectric constant

^{'} K^{'}

Q. A parallel plate capacitor is charged by a battery.

The battery is disconnected and a dielectric slab is inserted to completely fill the space between the plates.

How will (i) its capacitance, (ii) electric field between the plates and (iii) energy stored in the capacitor be affected ? Justify your answer giving necessary mathematical expressions for each case.

Q. Figure (31-E26) shows two identical parallel plate capacitors connected to a battery through a switch S. Initially, the switch is closed so that the capacitors are completely charged. The switch is now opened and the free space between the plates of the capacitors is filled with a dielectric of dielectric constant 3. Find the ratio of the initial total energy stored in the capacitors to the final total energy stored.

Q. Figure shows two identical parallel plate capacitors connected to a battery through a switch S. Initially, the switch is closed so that the capacitors are completely charged. The switch is now opened and the free space between the plates of the capacitors is filled with a dielectric of dielectric constant 3. Find the ratio of the initial total energy stored in the capacitors to the final total energy stored.

Q. The plates of a parallel plate capacitor with no dielectric are connected to a voltage source. Now a dielectric of dielectric constant

K

is inserted to fill the whole space between the plates with voltage source remaining connected to the capacitor.
Choose the correct statements.

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