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April 12, 2013 Electric Fields and Potential April 12, 2013 April 12, 2013 April 12, 2013 April 12, 2013 Electric Field It is a vector quantity. It has both magnitude and direction. The direction of the field is always determined, by convention, with a small, positive test charge. Electric Field strength can be calculated using: E = F/q and E = kq/d 2 http://phet.colorado.edu/en/simulation/efield April 12, 2013 April 12, 2013 A fly accumulates 3.0 x 10-10C of positive charge as it flies through the air. What is the magnitude and direction of the electric field at a location 2.0 cm away from the fly? April 12, 2013 Mr. Patel is photocopying lab sheets for his first period class. A particle of toner carrying a charge of 4.0 x 10-9C in the copying machine experiences an electric field of 1.2 x 106 N/C as it's pulled toward the paper. What is the electric force acting on the toner? April 12, 2013 Gordon the night custodian dusts off a classroom globe with a feather duster, causing the globe to acquire a charge of -8.0 x 10-9C. What is the magnitude and direction of the electric field at a point 0.4 m from the center of the charged globe? April 12, 2013 April 12, 2013 Electric Field Lines These are imaginary lines with arrow heads the show the direction along which hypothetical positive charges would move. Also called lines of force. There are 3 rules to drawing electric field lines: 1. Field lines must begin on positive charges or at infinity and must terminate on negative charges or at infinity. 2. The number of lines drawn leaving a positive charge or approaching a negative charge is proportional to the magnitude of the charge. 3. No two field lines from the same field can cross each other. April 12, 2013 Electric Fields April 12, 2013 April 12, 2013 April 12, 2013 April 12, 2013 Online lab http://phet.colorado.edu/en/simulation/charges-and-fields