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.

A) When the distance is halved, Q stays the same.
B) Inserting a dielectric increases C.
C) Increasing the distance increases the Electric field.
D) Inserting a dielectric increases Q.
E) When the distance is doubled, U increases.
F) When the distance is doubled, C increases.
G) Inserting a dielectric decreases U.

Explanation / Answer

A) True, the charge doesnt get affected by distance, only be inserting dielectric can we influence charge

B) True, dielectric lowers potential difference, thus changing capacitance

c) False, electric field is inversely proposional, means it decreases as length increases, E=kq/r^2

d) True

e) True

f) False

g) True

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