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Please, can someone help me quickly with these two problems

  • Thread starter akahmed
  • Start date
7
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Please, can someone help me quickly with these two problems!!!!!

1. Homework Statement
A parallel plate capacitor is constructed with a dielectric constant ( k = 3 * 10^8) The maximum projected voltage is 5000v and the capacitance needed is .5 micro Farads. Calculate the plate area.

2. Homework Equations
Q =VC, C = AE/d, C = KC


3. The Attempt at a Solution
Well, I can solve for Q, but that doesn't help. Also I don't know d!. Is 5 microfarads before or after the influence of the dielectric?

Another one, please :)
1. Homework Statement
Compute the capacitance on a cylindrical capacitor of length 5cm. This capacitor consists of two hollow concentric cylinders with radii of 1.5mm and 4mm (surface area of cylinder is 2pirl)

2. Homework Equations
2pirl, Q=VC


3. The Attempt at a Solution
I don't know the cylinder equations!
 

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