ELECTROSCOPE

Jun 17th, 2015
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An electroscope is an early scientific instrument that is used to detect the presence and magnitude of electric charge on a body. It was the first electrical measuring instrument. The first electroscope, a pivoted needle called the versorium, was invented by British physician William Gilbert around 1600.

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Name: Maomi MolinaSubject: Advanced PhysicsYear and Section: MS 4-EinsteinDate: September 03,2010ELECTROSCOPEAnelectroscopeis an earlyscientific instrumentthat is used to detect the presence and magnitude ofelectric chargeon a body. It was the first electricalmeasuring instrument. The first electroscope, a pivoted needle called theversorium, was invented by British physicianWilliam Gilbertaround 1600.Pith-ball electroscopeA pith-ball electroscope, invented by British weaver's apprenticeJohn Cantonin 1754, consists of a small ball of some lightweight nonconductive substance, originallypith, suspended by asilkthread from the hook of aninsulatedstand. In order to test the presence of a charge on an object, the object is brought near to the uncharged pith ball.If the object is charged, the pith ball will be attracted to it.Gold-leaf electroscopeThe gold-leaf electroscope was developed in 1787 by British clergyman and physicistAbraham Bennet,as a more sensitive instrument than pith ball orstrawblade electroscopes then in use. It consists of a verticalmetalrod, usuallybrass, from the end of which hang two parallel strips of thin flexiblegold leaf.PROCESS INVOLVED IN USING THE ELECTROSCOPECharging by ConductionCharging by conduction involves the contact of a charged object to a neutral object. Suppose that a positively charged aluminum plate is touched to a neutral metal sphere. The neutr

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