- #1
phalanx123
- 30
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A capacitor consists of two thin infinite concentric cylinderss with inner and outer radii a and b. If the outer cylinder has radius 10mm and the breakdown electric field of air is 3V per micrometre, what radius should be choosen for the inner cylinder in order to maximum the potential diffence V and what is that maximum.
I am really stuck on getting the radius of the inner cylinder. I know that the maximum electric field strength on the surface of the inner cylinder is 3V per micrometre. And I calculated the electric field strength on the surface of the inner cylinder E is E=λ /(2πεa)=3V per micrometre. where λ is the charge density per unit length. but I don't know this value, so I couldn't get the value a .
could somebody help me please? many thanks
I am really stuck on getting the radius of the inner cylinder. I know that the maximum electric field strength on the surface of the inner cylinder is 3V per micrometre. And I calculated the electric field strength on the surface of the inner cylinder E is E=λ /(2πεa)=3V per micrometre. where λ is the charge density per unit length. but I don't know this value, so I couldn't get the value a .
could somebody help me please? many thanks