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Physics E-1ax March 3, 2015 Activity 7: Field Lines and Coulomb’s Law • Let’s take a look at our “charges and fields” applet again, this time for a single point charge: http://phet.colorado.edu/en/simulation/charges-and-fields 1. Sketch some field lines on this plot. The rules are: • - Lines start on (+) charges, end on (–) charges. Lines can go off to infinity. - At any point in space, the field lines follow the direction of the electric field. - Number of field lines on a charge is proportional to amount of charge. - Lines cannot split or merge, and tend to stay far away from each other. - The field is stronger where the field lines are closer together. 1 q1 The electric potential created by a charge q1 is V (r) = . We can find (using 4πε 0 r calculus) the electric field created by q1: From a point charge q1, the electric field has magnitude E = and points away from positive charges and towards negative charges. 2. 1 q1 4πε 0 r 2 You place another charge q2 at a distance r from q1. What is the radial component of the force (Fr) of q1 on q2? 13