The plates of a spherical capacitor have radii 31.3 mm and 33.4 mm. (a) Calculat

Question

The plates of a spherical capacitor have radii 31.3 mm and 33.4 mm. (a) Calculate the capacitance. (b) What must be the plate area of a parallel-plate capacitor with the same plate separation and capacitance?

Ok, so I am fine on the first question, but I keep getting the second question wrong... I'm certain I am using the right equation but for whatever reason it is saying my answer is wrong.

Forumula I'm using: C=?A/d => A=Cd/?

The plates of a spherical capacitor have radii 31.3 mm and 33.4 mm. (a) Calculate the capacitance. (b) What must be the plate area of a parallel-plate capacitor with the same plate separation and capacitance? (a) Number 55.38 (b) Number 1.314 Unitst oF Unitsy cm 2 Unitsm 2

Explanation / Answer

C=eA/d

55.38 *10^-12 = (8.85*10^-12)*A/(2.1*10^-3)

A = 0.01314 m^2

A*10^4=131.4 cm^2

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