# A 500.0 pF capacitor consists of two circular plates of radius 0.30 mm?

A 500.0 pF capacitor consists of two circular plates of radius 0.30mm. How far apart are the plates? (The value of εo is 8.85*10^12C^2/N*m^2)...

The options are

a. 0.00057 μm

b. 0.0025 μm

c. 0.0050 μm

d. 0.00028 μm

I did the problem without knowing if i'm doing it correctly and I got 0.0050....

Can anyone tell me for sure if this is right, or help me get to the right answer if it isn't??

Thanks for any help. WIll pick best answer tonight!!

### 1 Answer

Relevance

- RogerLv 78 years agoBest Answer
you use C = εo(A)/d

5 x 10^-10 = (8.85 x 10^-12)(π)(0.30 mm)^2/d

d = ((8.85 x 10^-12)(π)(0.30 mm)^2)/5 x 10^-10

d = 0.0050 μm

so the answer is c) 0.0050 μm

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