Question 12 please O WebAssign-PHY 213 SP2018. × y va Hormework #3 ×G german tra

Question

Question 12 please

O WebAssign-PHY 213 SP2018. × y va Hormework #3 ×G german translate-Google Se ×M Inbox (3.193)-icsi222@g.uky × 3 Ways to Zoom in on a Ma C secure https://www.webassign.net web Student/Assignment Responses last?dep 8189777 Need Help? Read It 12. -3 points SerCP11 16.P.051 My Notes A parallel-plate capacitor has capacitance 9.50 F. (a) How much energy is stored in the capacitor if it is connected to a 17.00-V battery? (b) If the battery is disconnected and the distance between the charged plates doubled, what is the energy stored? (c) The battery is subsequently reattached to the capacitor, but the plate separation remains as in part (b). How much energy is stored? Need Help? ReadIt Submit Assignment Save Assignment Progress Home My Assignments Extension Request WebAssign® 4.0 1997-2018 Advanced Instructional Systems, Inc. All rights reserved.

Explanation / Answer

(a) U = C V^2 /2

U = (9.50 x 10^-6) (17^2) /2

U = 1372.75 x 10^-6 J  

Or 1372.75 uJ

(B) now Q will remain same.

d' = 2 d

C' = C/2 { C = e0 er A / d }

and U = Q^2 / 2 C

so U' = 2 U = 2745.5 uJ ......Ans

(C) now C' = C/2

and V' = V

U' = C' V'^2 /2 = (C/2) v^2 /2 = U/2

U' = 686.4 uJ ....Ans

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