How to find the Dielectric Strength

  • Thread starter jra_1574
  • Start date
  • #1
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Hello, everyone!

I have a question, and i don't know how to solve it...
They ask me for the dielectric strength!
How do i find it?
 

Answers and Replies

  • #2
rock.freak667
Homework Helper
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Type out the entire problem so we can help you...
 
  • #3
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The full question is like this:

The square plates of a 9000pF capacitor measure 90mm by 90mm and are separated by a dielectric which is 0.29mm thick. The voltage rating of the capacitor is 300V. THe dielectric strength, in KV/m is closest to:
A. 1300
B. 930
C. 1200
D. 1100
E. 1000

To be honest i have no idea how to approach this problem.
 
  • #4
rock.freak667
Homework Helper
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31
for such a capacitor,the capicitance is given by

[tex]C=\frac{\epsilon_0 A}{d}[/tex] where d=thickness and A=area
 
  • #5
13
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ok i did the calculation

Eo = 8.85 x10^-12
A= 8.1x10^-3
d = 2.9x10^-4


so the final answer is C = 2.4719x10^-10

Now what should i do?
 
  • #6
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Can u tell me where did u find the problem coz that was the same question in my exam? So that I can predict future exam qts.
 
  • #7
13
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It was actually in my exam a few years ago.. i solved the problem in class tho... i don't remember the answer, but the equation given here was very useful... :)
 

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