An air-filled capacitor consists of two parallel plates, each with an area of 7.60 cm2, separated by a distance of 1.70 mm. A 23.0-V potential difference is applied to these plates. (a) Calculate the electric field between the plates. 13.5 kV/m (b) Calculate the surface charge density. There are a number of ways to get to this answer. How do you calculate the electric field due to a uniform surface charge density? nC/m2

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Density of Solids

The density of a substance refers to how much matter is present in a given amount of space. It is expressed as the ratio of the mass of the substance to its volume.