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.

True/False  When the distance is doubled, C increases.
True/False  Increasing the distance increases the Electric field.
True/False  Inserting a dielectric increases Q.
True/False  When the distance is halved, Q stays the same.
True/False  Inserting a dielectric increases C.
True/False  Inserting a dielectric decreases U.
True/False  When the distance is doubled, U increases.

Explanation / Answer

True statements are

(1) When the distance is halved, Q stays the same.

(2) Inserting a dielectric increases C.

(3) Inserting a dielectric decreases U

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