20_Electric_Forces

20_Electric_Forces - Electric Forces and Fields Charge...

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1 Electric Forces and Fields Charge Coulomb's Law Electric Fields Parallel plates Dipoles
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2 Friction causes these effects Pollen sticks to bees Dust sticks to TV Static cling of clothes Shocks touching metal door handles Sparks stroking cats Friction is producing some type of force
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3 Experimental evidence has lead to the Electric Charge Model Friction between objects can cause charge to be added or lost Charge has two kinds - Positive and Negative Charges exert force like charges repel opposite attract The force acts over a distance (non-contact) Neutral objects have an equal mixture of +ve and -ve charges
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4 What is charge ? Basic property of matter Carried by Electrons (-ve) and Protons (+ve)
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5 Insulators Electrons cannot move through the material Electrons can be removed or added by friction Examples – Glass, Plastic
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6 Conductors Electrons are free to move through the material Example – metals, graphite
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7 Charge Induction Separation of charge by the influence of an electric field Action over a distance Charges can be induced on insulators and conductors
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Charge Induction in Conductors A charged object can induce a charge in a
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This note was uploaded on 12/28/2011 for the course PHYSICS 122 taught by Professor Bhagat during the Fall '11 term at Maryland.

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20_Electric_Forces - Electric Forces and Fields Charge...

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