Enhanced EOC: Problem 26.17 Part A Two circular disks spaced 0.50 mm apart form
ID: 1657335 • Letter: E
Question
Enhanced EOC: Problem 26.17 Part A Two circular disks spaced 0.50 mm apart form a parallel-plate capacitor. Transferring 1.60 × 109 electrons from one disk to the other causes the electric field strength to be 1.40 × 105 N/C What are the diameters of the disks? Express your answer with the appropriate units Hints You may want to review (Lm-pages 764-766) For help with math skills, you may want to review: Rearrangement of Equations Involvi D-Value Units Mathematical Expressions Involving Squares Submit My Answers Give Up Provide Feedback ContinueExplanation / Answer
The electric field strength inside the capacitor is
E= Q/ eo A
A= Q/ eo E
A = ne/eo E
= 1.6* 10^9 ( 1.6* 10^-19)/8.85 * 10^-12 ( 1.4* 10^5 )
=2.066 * 10^-4 m^2
A= pi D^2/4
2.066 * 10^-4 m^2= pi D^2/4
D=sqrt 4 A/ pi
= sqrt 4 (2.066 * 10^-4 m^2)/ pi
=1.62 cm
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