Electric Charges and Energy Systems
Explore scenarios involving electric charges in equilateral triangles, superposition of energy systems, field energy interactions, and capacitor energy variations. Understand concepts and outcomes related to charge configurations and energy changes in different systems.
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Presentation Transcript
2.47 Three identical charges +q sit on an equilateral triangle. What would be the final KE of the top charge if you released it (keeping the other two fixed) 2 +q a a a +q +q 2 A) B) 1 4pe0 a 2 q 1 2q 3a 4pe0 2 1 3q a 1 2q C) D) 4pe0 a 4pe0 E) other
2.48 Three identical charges +q sit on an equilateral triangle. What would be the final KE of the top charge if you released all three? 2 +q a a a +q +q 2 A) B) 1 4pe0 a 2 q 1 2q 3a 4pe0 2 1 3q a 1 2q C) D) 4pe0 a 4pe0 E) other
Does system energy superpose? That is, if you have one system of charges with total stored energy W1, and a second charge distribution with W2 if you superpose these charge distributions, is the total energy of the new system simply W1+W2? A) Yes B) No
r Two charges, +q and q, are a distance r apart. As the charges are slowly moved together, the total field energy e t 2 0 E d 2 (Come up with two different reasons for your answer. ) A) increases B) decreases C) remains constant
+Q -Q A parallel-plate capacitor has +Q on one plate, -Q on the other. The plates are isolated so the charge Q cannot change. As the plates are pulled apart, the total electrostatic energy stored in the capacitor A) increases B) decreases C) remains constant. (Come up with two different reasons for your answer. )
