Problem 26.33 - Enhanced with Hints Part A A 1.50-cm-diameter parallel-plate cap

Question

Problem 26.33 - Enhanced with Hints Part A A 1.50-cm-diameter parallel-plate capacitor with a spacing of 0.200 mm is charged to 400 V You may want to review (Pages 729 - 730) For help with math skills, you may want to review Substituting Num Substituting Num What is the total energy stored in the electric field? Express your answer with the appropriate units. View Available Hint(s) bers into Mathematical Expressions 1 bers into Mathematical Expressions 2 1.57.10J Submit revious Answers Incorrect; Try Again; 5 attempts remaining Part B What is the energy density? Express your answer with the appropriate units View Available Hint(s) Value Units

Explanation / Answer

A) C = A*/d = 3.14*0.752*10-4*8.854*10-12/0.2*10-3 = 7.81*10-12 F

U = 0.5*C*V2 = 0.5*7.81*10-12*4002 = 6.25*10-7 J

B) E = v/d = 400/0.2*10-3 = 2*105 N/c

u = 0.5**E2

= 0.5*8.854*10-12*(2*105)2

= 17.70 J/m3

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