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Which statements are correct/incorrect for two oppositely charged,isolated paral

ID: 1721841 • Letter: W

Question

Which statements are correct/incorrect for two oppositely charged,isolated parallel plates: (C=capacitance, U=stored energy, +Q and-Q = charge on the plates).
CorrectIncorrect Inserting a dielectric increases Q.
CorrectIncorrect When the distance is doubled, C is halved
CorrectIncorrect When the distance is doubled, U is unchanged.
CorrectIncorrect When the distance is halved, Q is halved.
CorrectIncorrect Increasing the distance, increases the E field.
CorrectIncorrect Inserting a dielectric decreases U.
CorrectIncorrect Inserting a dielectric decreases C.

I've tried to figure this out on my own on a separate diagram, butthis is what I came up with. Can any physics experts help me onthis one? A diagram would be nice so I can compare it withmine.

Explanation / Answer

   Inserting a dielectric increases Q correct
   When the distance is doubled, C ishalved correct    When the distance is doubled, U is unchangedincorrect    When the distance is halved, Q is halvedcorrect    Increasing the distance, increases the Efield correct    Inserting a dielectric decreases Ucorrect    Inserting a dielectric decreases Cincorrect