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electrostatics - ES2 Electrostatics II electrometer V q C-q...

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ES2 Electrostatics II electrometer V C +q - q In this lab you will further explore electrostatic by exploring the distribution of charges on conductors. The basic tool for measuring charges is the electrometer which is a voltmeter with a very high input resistance. The principle is shown in the figure. To measure the charge q on the plates of the capacitor C, all we have to do is to determine the voltage V across its plates. The charge q is given by: CV Thus the charges we measure using this method are proportional to the electrometer reading q = proportional to the electrometer reading. (page 1)
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electrometer Proof plane The capacitor we use is known as the “Faraday pail”. It consists of an inner and an outer can known as “pail” and (page 2) - + + + pail shield and an outer can known as pail , and “shield”, respectively. If we introduce a positive charge +q inside the pail this induces charges –q and +q on the inner + - + + + - - - - - - + ground induces charges q and q on the inner and outer surfaces of the pail. A charge – q is also induced on the inner surface of the shield. A positive charge +q on the q outer surface of the shield escaped to the ground
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