Which statements are true for two oppositely charged, isolated parallel plates:

Question

Which statements are true for two oppositely charged, isolated parallel plates: C = capacitance, U = stored energy (Q and -Q = charge on the plates). Note: Isolated plates can not lose their charge. Increasing the distance increases the Electric field. Inserting a dielectric decreases U. When the distance is halved, Q stays the same. When the distance is doubled, C increases. Inserting a dielectric increases Q. Inserting a dielectric increases C. When the distance is doubled, U increases. Tries 0/20

Explanation / Answer

The Electric field is not dependent on the distance, but on the area. False.
Inserting a dielectric increases C, so U increases proportionally. False.
If distance is changed, the capacitance changes, so q will change as well. False.
Since d is the denominator, when it increases, C decreases. False.
Dielectrics increase C, which increases Q. True.
C = εok (A/d), so adding a dielectric increases C. True. 

When d increases, C decreases, and U = (1/2) CV2 , so U would in fact decrease. False.

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