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Electric Fields ch 26 Electric fields of point sources AND E fields of other “common shapes” Electric Fields Electric fields of shapes include….. Point source Really long wire Really wide flat plane Really spherical sphere We’ve already discussed the point source and that electric Field lines point in the direction of the Force acting on a positive test charge. Electric Fields For electric fields of multiple point charges, find the electric field from each point separately and then add them up (add as vectors with direction) Electric Field Lines help visualize the e-field. E field lines are closer where the field is stronger E field lines begin on a positive charge and end on a negative charge. Electric Field of a continuous charge distribution To find the e-field of other shapes, break the shape up into little bitsy tiny small pieces, each of which creates an electric field like a point source. By summing these up (integrating) you determine the e-field of the whole shape. Our book goes through the integration for a long charged wire and a ring, plane and sphere.(recommend reading these derivations) We’ll also look at one of the simulations on archive.org to see how these derivations are done. Electric Field: affect on a charge in an e-field A charged object in the e-field experiences a force. Using E = F/q determine the Force acting on the charged object (where q is the charge on the object affected by the electric field E) Knowing F, you can determine the objects motion using Newton’s 2nd law……F = ma