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30 Cards in this Set
- Front
- Back
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Induction
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When object is charged, it acquires a charge opposite in sign to the charging rod. (Temporary)
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Conduction
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When object is charged, it acquires the same charge as the charging rod. (Permanent)
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Electroscope
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Device used to detect charges.
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What happens when a negatively-charged rod touches the knob of the electroscope?
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Electrons are added to the knobe and spread over all the metal surfaces.
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What happens when the two leaves insdie the electroscope are -?
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Repel eachother
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Charging by Induction
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WHen charging a neutral body by contact w/ a charged body.
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What happens when the electroscope is given a + charge?
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Leaves become positive and repel eachother.
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Coulombs law
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describes the force btwn 2 charged objects
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What happens when the electric force varies INVERSELY?
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Square btwn the two charged objects
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What happens when the electric force varies DIRECTLY?
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The product of the charges of the object
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Coulomb's charge
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6.25 X 10 ^18 electrons
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Electric field exists when?
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In a resion of space around a charged object
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How is the strength of the fields indicated?
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By the spacing btwn the lines. And is STRONGEST when lines are closer togetherBy
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How is static electricty produced?
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By friction btwn 2 objects
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When a rubber rod is rubed w/ fur?
When glass is rubbed w silk? |
-
+ |
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All static charges lie where?
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On the surface of an isolated conductor
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Charges are ____ off at sharp points of a conductor, and the field is ____ at these points.
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Leaked, stronger
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A lightning rod has a _____ shape so that the lightning will strike the rod rather than the house. From the rod, the charges flow to the _____.
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Pointed, ground
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Potential Difference
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the amount of work involved when a charge moves bten 2 pts
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Voltage
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energy(work) per charge
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Coulmbs unit?
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Unit for electirc charge
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Voltage unit?
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Potential difference
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Earth is considered what?
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Inexhaustible source of electrons.
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Earth is?
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Neutral
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When an object enters the earth it is?
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Grounded
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When the air around a charged object becomes______, an electric discharge can occur which can be a rapid _____ or a slow_____.
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Charged, arc, corona
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Arc? Ex?
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rapid- lightning
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Corona? Ex?
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Slow- St. Elmos fire
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When the - charged bottom of a storm cloud is close to the earth, the ground becomes_____ charged by ______. A discharge can occur involving millions of volts. This is ______.
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positive, induction, lightning
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2 unlike charges ____ each other, so work must be donw to move them _____. When work is donw on the charges, it is stored as ____ energy.
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Attract, away, potential
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