Which statements are true for two oppositely charged isolate

Which statements are true for two oppositely charged, isolated parallel plates: (C-capacitance, U=stored energy, and- = charge on the plates). Note: Isolated plates can not lose their charge. (Give ALL correct answers, i.e., B, AC, BCD...) A) When the distance is doubled, U increases B) Inserting a dielectric increases C. C) When the distance is halved, Q stays the same. D) Increasing the distance increases the Electric field E) When the distance is doubled, C increases F) Inserting a dielectric decreases U G) Inserting a dielectric increases

Solution

A) False. When the distance is increased, the potential energy of the capacitor decreasses.

B) True. Inserting the dielectric increases the capacitance of the capacitor

C) True. Charge on the capacitor does not depend on the distance.

D) False. Increasing the distance decreases the electric field

E) False. When the distance is increased, capacitance decreases.

F) True. Inserting di electric increases the capacitance and hence energy increases.

G) True. Due to induced charges , inserting a dielectric increases Q.