# lecture4 - Ele ctric Fie Line ld s le ld s Drawing e ctric...

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Electric Field Lines Drawing electric field lines Motion of charged particles in an electric field Electric flux

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Electric Field Lines Electric Field Lines Electric field lines are a way of visualizing the field. Rules for Drawing field lines: 1) Lines start on (+) charges, end on (-) charges, or go to infinity 2) (# of lines) charge 3) Lines never cross 4) Strength of field is proportional to the density of field lines Interpreting the picture: is parallel to the field line at each point. E
Electric Field lines for an isolated Charge +Q + E – magnitude of field E E Q E

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+ Area S, E Where is the density of field lines greatest?
2 Point Charges 2 Point Charges -2Q +Q Note: number of lines on -2Q is twice as many as on +Q

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Quiz: Quiz: -q + q Which way will the dipole start to move in the electric field? A) up B) down C) left D) right E) nowhere – there is no net force.
Quiz: Quiz: -q + q Does this dipole feel a torque ? A) Yes - clockwise B) Yes – counter clockwise C) No D) Depends on the strength of E

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lecture4 - Ele ctric Fie Line ld s le ld s Drawing e ctric...

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