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Introduction to electromagnetism. Mike Pentz demonstrates the presence of electromagnetic force using electrified brass rods. Attraction/deflection when a current passes through both is demonstrate...d. Alan Walton demonstrates electric flow through wires. He shows that there is an actual flow by using a paddle device which is rotated by a flow of electrons passing over the paddles. Can the flow be collected? Walton demonstrates that it can when he passes an electric current through metal spheres. Spheres are brought together through electromagnetic attraction and remain together when the current is switched off. The electrostatic force remains in the spheres. An oscilloscope is used to measure the amount of charge transferred. Introduction to fields of force. Russell Stannard uses models to demonstrate fields of force. He rolls ball bearings down a slope. They are deflected by irregularities in the slope. The force here is gravity. Diagram of an electron gun from a cathode ray tube is shown to demonstrate how this deflection by a field of force can be used to focus electrons. Stannard uses a two dimensional model to demonstrate the same point.
Metadata describing this Open University video programme
Module code and title: S100, S100 Science foundation course
Item code: S100; 04
Recording date: 1971-01-31
Rights Statement: Rights owned or controlled by The Open University
Restrictions on use: This material can be used in accordance with The Open University conditions of use. A link to the conditions can be found at the bottom of all OUDA web pages.
Duration: 00:24:30
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Producer: Tony Jolly
Contributors: Michael Pentz; Russell Stannard; Alan Walton
Publisher: Open University
Subject terms: Electromagnetism; Field theory (Physics); Gravity Force and energy
Production number: JOUZ359P
Videofinder number: 2782
Available to public: no