https://physlab-wiki.com/ 2026-04-19T13:07:55+00:00 https://physlab-wiki.com/ https://physlab-wiki.com/lib/tpl/UChicago/images/favicon.ico text/html 2024-06-06T22:50:58+00:00 Anonymous (anonymous@undisclosed.example.com) https://physlab-wiki.com/physicsdemos/electricity_and_magnetism/electric_fields_and_potential/crt_electron_beam_deflection_with_an_electric_field?rev=1717728658&do=diff CRT Electron Beam Deflection with an Electric Field A cathode ray tube (CRT) is used to show the deflection of an electron beam in the presence of an electric field created by applying a potential to plates inside the CRT. Setup See Electric Fields II: Acceleration and Deflection of Electrons for setup. text/html 2021-09-15T12:47:13+00:00 Anonymous (anonymous@undisclosed.example.com) https://physlab-wiki.com/physicsdemos/electricity_and_magnetism/electric_fields_and_potential/faraday_cage_with_electroscopes?rev=1631724433&do=diff Faraday Cage with Electroscopes A rod with static electric charge is brought near a gold leaf electroscope that has been placed inside a Faraday cage. A second electroscope is connected to the cage itself. The electroscope inside the cage responds to the charged rod only when the lid is left off of the cage. When the lid covers the cage the electroscope inside is unaffected by the charged rod but the electroscope connected to the cage deflects. text/html 2021-09-15T12:44:35+00:00 Anonymous (anonymous@undisclosed.example.com) https://physlab-wiki.com/physicsdemos/electricity_and_magnetism/electric_fields_and_potential/faradays_ice_pail?rev=1631724275&do=diff Faraday's Ice Pail A hollow, conducting sphere with a small hole in its top is electrostatically charged using a dielectric rod rubbed with fur. One can show with an electroscope that a conductor brought in contact with the inside of the sphere will not acquire a charge but will acquire charge if touched to the outside of the sphere. text/html 2021-09-15T12:48:09+00:00 Anonymous (anonymous@undisclosed.example.com) https://physlab-wiki.com/physicsdemos/electricity_and_magnetism/electric_fields_and_potential/grass_seed_electric_field_lines?rev=1631724489&do=diff Grass Seed Electric Field Lines Electric field lines are made visible using grass seeds and a Wimshurst machine. A variety of electrode geometries is available. Electrode plates may be used in conjunction with an overhead projector for easier viewing. text/html 2021-09-15T12:50:27+00:00 Anonymous (anonymous@undisclosed.example.com) https://physlab-wiki.com/physicsdemos/electricity_and_magnetism/electric_fields_and_potential/millikan_oil_drop?rev=1631724627&do=diff Millikan Oil Drop The motion of oil droplets in free fall and in the presence of an electric field can be viewed using the Pasco Millikan Oil Drop apparatus. A video camera with its lens at the eyepiece of the microscope allows projection. L0, rest from labs text/html 2021-09-15T12:50:04+00:00 Anonymous (anonymous@undisclosed.example.com) https://physlab-wiki.com/physicsdemos/electricity_and_magnetism/electric_fields_and_potential/nonspherical_conductor?rev=1631724604&do=diff Nonspherical Conductor A nonspherical conductor is electrostatically charged using a dielectric rod rubbed with fur. An electrometer connected to a Faraday cage shows the magnitude of charge transferred by a paddle from either end of the charged conductor. text/html 2021-09-15T12:51:11+00:00 Anonymous (anonymous@undisclosed.example.com) https://physlab-wiki.com/physicsdemos/electricity_and_magnetism/electric_fields_and_potential/removable_spherical_conducting_shell?rev=1631724671&do=diff Removable Spherical Conducting Shell * Clean the insulating support stand with methanol to remove conducting materials. * Rub the dielectric rod with fur. * Touch the charged rod to the conducting sphere, being sure to bring as much rod surface into contact as is practical. Re-charge the rod and sphere if necessary.