Charge resides on the outside of a conductor.

• D+10+12

diagram for demo

Charge resides on the outside of a conductor. The large hollow metal sphere is electrostatically charged. (The Wimshurst machine gives a good charge. The electrophorous works less well. See D+10+18-22). 1] Touch the inside of the hollow sphere with the 'proof' sphere mounted on the Teflon handle, then touch the electroscope with the 'proof' sphere. The metal pointer does not move, indicating that no charge resides on the inside of a conductor. 2] Touch the outer surface of the hollow sphere with the small 'proof' sphere. Move the small sphere to touch the top metal plate of the Braun electroscope. The metal pointer will move, indicating that there is charge on the outside of the hollow sphere.

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Related Demos

D+10+0 Electric fields: Lines of force shown on an OHP. D+10+2 Transparency: Mapping of an electric field. D+10+4 Pith balls on thread, with positive and negative charged rods. D+10+5 Vector arrows to show electric field and particle motion D+10+6 Attraction and repulsion of charged styrofoam balls. D+10+8 Braun and Leaf electroscopes. D+10+9 Discharging an electroscope through ionization D+10+10 Faraday's ice pail: Charge induced on the outside of a pail. D+10+11 Alternate charge resides on outside of conductor D+10+13 Faraday cage: blocks signal from portable radio D+10+14 Charging an electroscope by induction. D+10+16 Separation of charge using electrical tape and an electroscope. D+10+18 Electrophorous: Cat fur on teflon, acetate on lucite. D+10+20 Van de Graaff generator. D+10+22 Wimshurst machine, large or small. D+10+24 Electrostatic pinwheel:Van de Graaff makes pinwheel spin. D+10+25 Like Charges Attract D+10+26 Various Leyden jars to show. D+10+28 Electrostatic doorbell: Ball bangs between charged plates. D+10+30 Kelvin water drop electrostatic charge generator. D+10+35 Electric field created by Van de Graff splits ions in flame D+10+40 Applet: Charges and Fields D+10+45 Polarization of can causes rolling D+10+45 Applet: Electric Field Hockey D+10+50 Applet: Electric Field of Dreams D+10+55 Applet: John Travoltage D+10+60 Applet: Balloons and Static Electricity D+10+65 Applet: 3D Electrostatic Field Simulation D+10+75 Applet: Field and potential produced by point charges D+10+80 Applet: Electrostatics Visualizations - The Charged Metal Slab D+10+85 Applet: Electric Field D+10+90 Electrostatics Index D+10+95 Applet: Electrostatics Simulation D+10+100 Applet: 2-D Electrostatic Field Simulation