11. [5pt] Which statements are true for two oppositely charged, isolated paralle
ID: 1440700 • Letter: 1
Question
11. [5pt]
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. (Give ALL correct answers, i.e., B, AC, BCD...)
A) When the distance is halved, Q stays the same.
B) Inserting a dielectric increases Q.
C) When the distance is doubled, U increases.
D) Inserting a dielectric decreases U.
E) Increasing the distance increases the Electric field.
F) When the distance is doubled, C increases.
G) Inserting a dielectric increases C.
Explanation / Answer
A) When the distance is halved, Q stays the same.
Since plates are isolated, Q cannot change
B) Inserting a dielectric increases Q.
Dielectric decreases electric field, and U is directly proportional to electric field.
C) When the distance is doubled, U increases.
Since plates are isolated, Q cannot change
D) Inserting a dielectric decreases U.
Inserting a dielectric decreases the electric field, and C is inversely proportional to the electric field.
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