Dielectrics & Energy

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1.
A capacitor of 2 uF is charged to 100 V. The energy stored is:
2.
In the previous problem, the energy stored after inserting the dielectric is:
3.
A capacitor connected to a battery has energy U. A dielectric (K=4) is inserted. The new energy is:
4.
The force between the plates of a parallel plate capacitor (charge Q, area A) is:
5.
A capacitor of 4 uF is charged to 200 V and disconnected. A dielectric (K=2) is inserted. The new voltage is:

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