2054Lecture5 - Electric Charge & Coulomb’s Law...

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Unformatted text preview: Electric Charge & Coulomb’s Law Coulomb’s Topics of Discussion Topics Electric Charge Conductors & Insulators Two Ways to Charge a Body Coulomb’s Law A Comparison between Gravity & Comparison Electrostatics Electrostatics Electric Charge Electric Charges come in two varieties: positive Charges and negative. and Like charges repel. Unlike charges attract. Negative charges are transferred from one Negative body to another. body Charge is quantized in multiplies of Charge e=1.60219×10-19C, where C is the Coulomb. e=1.60219 where Charge is a conserved quantity. Conductors & Insulators Conductors A material which allows electric charges to material flow is called a conductor. conductor A material which prevents the flow of material electric charges is called an insulator. insulator. Two Ways to Charge a Body Two Conduction occurs when a charged body is in contact with an isolated body so that excess contact charge flows to an isolated body making it charged. charged. Induction occurs when a charged body is placed near an uncharged body then excess charges near are allowed to leave via a path to ground so that the uncharged body becomes charged. the Coulomb’s Law Coulomb’s The force is inversely proportional to the The distance r between charged bodies and it is directly proportional to the magnitude of the charges q1 and q2 of the charged bodies. The magnitude of the force F between the two charges is given by charges 1 q1 q 2 F= 2 4π ε 0 r where εo=8.85×10-12C2/Nm2 is the permittivity where constant. constant Newton’s Universal Law of Gravity Newton’s The force is inversely proportional to the The distance r between bodies and it is directly proportional to the magnitude of the masses m1 and m2 of the bodies. The magnitude of the force F between the two bodies is given by between m1m2 F=G 2 r where G=6.673×10-11Nm2/kg2. where G=6.673 Coulomb’s Law Algorithm Coulomb’s To determine the net force acting on a charge: Draw a free-body diagram of all the forces Draw acting on the charge, observing that like charges repel and unlike charges attract. charges Construct a vector table and find the net Construct Coulomb force. Coulomb ...
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This note was uploaded on 02/10/2010 for the course PHY 2053 taught by Professor Hardy during the Spring '10 term at University of Southern Maine.

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