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Unformatted text preview: 2/11/2009 1 We can extract important information about the electric potential inside a capacitor: The equipotential surfaces, shown in the fig below represent all the points that are at the same potential. This means, the potential difference b/w any two points on a surface is zero. The electric field vectors are perpendicular to the equipotential The electric field vectors are perpendicular to the equipotential surfaces. The potential decreases along the direction of the electric field, means that the electric field always represents the downhill of the electric potential. We can see in the fig below that the potential difference b/w any two points are the same in all three cases. Even though you are changing the zero potential (V = 0) of the parallel-plates, but the physical situation will remain the same. We are getting the same value of V C = V +- V- = 50 V 2/11/2009 2 Ex: A parallel-plate capacitor is constructed of two 2cm diameter disks spaced 2mm apart. It is charged to a potential difference of 500 V. a. What is the electric field strength inside?...
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