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Transcript
Quick notes The Electric Field Make sure to read pg. 453-459 1. Electric forces act over distances meaning there is a force between two objects even if they are not touching. 2. “fields” were developed by Michael Faraday 3. An electric field goes out from every charge 4. If a second charge is placed near a first charge, it feels a force exerted by the electric field. 5. A test charge can be used to investigate an electric field 6. A n electric field (E) is defined as the force exerted on a positive test charge placed at a point in space divided by the magnitude of the test charge 7. E = F/ q where is the magnitude of the test charge and is given an SI unit of newtons per coulomb 8. E describes the effect of the charges creating the electric field and not just the charge itself 9. For a single point charge e can also be written as: E = k Q/r2 10. Using k = ¼ e0 then E = ¼ e0 Q/r2 Problem Solving for Electric Fields 1. Draw a free-body force diagram for each object, showing all forces on that object and determine the direction of each force remembering like charges repel and unlike charges attract. 2. Apply Coulomb’s law to calculate the magnitude of the force each charge produces at a given point 3. Add all the force on that object using vectors to get the resultant