Round your answer(s) to three significant fugures. The bottom of a thundercloud

Question

Round your answer(s) to three significant fugures. The bottom of a thundercloud and the Earth's surface might be modeled as a charged parallel plate capacitor. The base of the cloud, which is roughly parallel to the Earth's surface, serves as the negative plate and the region of Earth's surface under the cloud serves as the positive plate. The separation between the cloud base and the Earth's surface is small compared to the length of the cloud. Part 1 out of 2 (a) Find the capacitance for a thundercloud of base dimensions 5.10 km by 1.50 km located 687 m above the Earth's surface

Explanation / Answer

A)
Use the equation for capacitance: C=Sigma_not A/d
A=5100m*1500m=7650000
Sigma_not=8.85x10-12
d= 687m

put all values to get

C = 0.0985 µF

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