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Electroscopic View

This Prezi will help students understand what an Electroscope is and how we can use it when measuring static electricity
by

Chisom Onwuka

on 29 January 2013

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Transcript of Electroscopic View

Electroscopic View What is an Electroscope? An electroscope is basically what it sounds like.
It is an Instrument used to measure and detect the presence or magnitude of electric charge on a body. It's considered the first electric measuring system. How does it work? Who comes up with this stuff?
Ain't nobody got time fo that? The first idea of this was by John Canton in 1754. He was a British weavers apprentice. His model was called the Pith-ball electroscope. consists of a small ball of some lightweight non-conductive substance, originally a spongy plant material called pith, although modern electroscopes use plastic balls. The ball is suspended by a silk thread from the hook of an insulated stand. 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 ball will be attracted to it and move toward it. This is caused by polarization......blah blah blah positive to negative atoms, basic chemistry. An electroscope is an instrument for detecting the presence of static electricity. It consists of two thin metal leaves suspended from a metal hook. When the hook is brought near a source of static electricity, some of the electrons in the hook are pushed to the leaves (if the source is negative) or pulled up to the hook from the leaves (if the source is positive). Overall it helps you determine the charge of the object. Electroscopes detect electric charge by the motion of a test subject due to the Coulomb electrostatic force. The voltage of an object equals its charge divided by its capacitance (the ability to store electric charge C=q/v) But he aint the only one though. -_- Abraham Bennet In 1787, a British clergyman and physicist came up with the Gold-leaf electroscope. It's more sensitive than the pith-ball electroscope. It was made up of a medal rod most likely made of brass and at the end of the rod are two strips of thin"gold leaves." A disk or ball terminal is attached to the top of the rod, where the charge to be tested is applied. When the metal terminal is touched with a charged object, the gold leaves spread apart in a 'V'. This is because some of the charge on the object is conducted through the terminal and metal rod to the leaves. Since they receive the same sign charge they repel each other and thus diverge. If the terminal is grounded by touching it with a finger, the charge is transferred through the human body into the earth and the gold leaves close together. Ta-da So what does this do? Since i couldn't make an Electroscope, here is a brilliant teacher (not as brilliant as Mr. Mitchell) that helps explain the device. By Chisom Onwuka
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