# Electric fields - from single charge to charged plates Mr Ang JL 27 Feb 2010.

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Electric fields - from single charge to charged plates Mr Ang JL 27 Feb 2010

Creating the slides  Using the Java applet simulation from http://phet.colorado.edu/simulations/sims.php?sim=Charges_and_Fields http://phet.colorado.edu/simulations/sims.php?sim=Charges_and_Fields  The simulation allows the user to view the electric field around a charge or charges, and explore electric force on a positive test charge

Electric field of a single charge

 Two positive test charges are placed near it.  The arrows indicate the direction of the forces.  The length of the arrows indicate the strength of the force

 The small arrows around the positive charge represent the electric field Direction & Magnitude (the fainter the weaker the field)  Electric field is a vector A radial field

Electric field of a few charges

 For two neighbouring like charges, the fields “cancel” each other in the region between them, so it appears to be “horizontal”, instead of radial

 Bringing the two neighbouring like charges closer, the “canceling” effect become clearer.

 Adding more like charges, observe that the field “lines” are perpendicular to each row of like charges.  Near the ends of each row, the field is more radial

 Bringing the two rows of charges closer, does the field look like that for two charged plates?

A uniform field between two charged plates

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