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Transcript
Describe how a negatively charged balloon would interact with: -another negatively charged balloon -your positively charged hand -two positively charged hands on either side, equal distance apart Broadneck High School Outcome: The student will be able to identify and calculate properties of electric fields through written practice and student led instruction. Broadneck High School What will we actually be doing? Drill Outcome Review Quiz Power point Classwork Broadneck High School Electric Fields Chapter 21.1: Creating and Measuring Electric Fields Broadneck High School Remember the Balloon Lab? How did the balloons react? Did it work in three dimensions? What else creates forces in 3 dimensions? Broadneck High School Relationship to gravity Much like gravity, electric force is inversely proportional to the distance squared Fg = GM1M2/d2 F = Kq1q2/d2 Broadneck High School How can a force be exerted across what seems to be empty space? WHAT??? Michael Faraday suggested that because an electrically charged object, A, creates a force on another charged object, B, anywhere in space, object A must somehow change the properties of space. Object B somehow senses the change in space and experiences a force due to the properties of the space at its location. We call the changed property of space an electric field. Broadneck High School In simple terms: An electric field means that the interaction is not between two distant objects, but between an object and the field at its location. Broadneck High School Electric Fields Can do work, transferring energy This is shown when using appliances Broadneck High School How do we calculate electric fields? Place a small charged object at some location. If there is an electric force on it, then there is an electric field at that point. q’ is the symbol for test charge Broadneck High School F is in Newtons q is in Coulombs What is E going to be in? Broadneck High School Test Charge Smaller test charge (q’) = what force? Larger test charge magnitude = what force? Does electric field magnitude change with different test charge size? What happens if you use too large a test charge? Broadneck High School All are vector quantities For charge use + or Mr. Schwenke and Mr. Witmer recommend using words for direction not + or Broadneck High School Broadneck High School Broadneck High School Broadneck High School Drawing electric Fields Positive charges push things away Negative charges pull things towards Field lines should be in proportion to charge Broadneck High School Creating electric fields http://www.cco.caltech.edu/~phys1/java/ phys1/EField/EField.html Broadneck High School Exit ticket Take out a piece of paper and draw an electric field between a +1 charge and a -2 charge Broadneck High School