Presentation on theme: "Electric fields - from single charge to charged plates Mr Ang JL 27 Feb 2010."— Presentation transcript:
Electric fields - from single charge to charged plates Mr Ang JL 27 Feb 2010
Creating the slides Using the Java applet simulation from 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?