British Universities Film & Video Council

moving image and sound, knowledge and access

Smt356 Videocassette 2

Synopsis
A: Demonstrates the power of Gauss’s Law both in the way it can be used to help to calculate the electric field near some arrangements of charge and to understand what is going on in some practical situations. Discusses the use of Gauss’s Law to explain how it is possible to charge up an isolated hollow metal sphere to a very high potential.
B: Examines the shape of the electric potential function V in the neighbourhood of a point charge and electric dipole.
C: Explores some of the basic properties of dielectrics. Unlike and electrical conductor in which electrons are free to move throughout a material, a dielectric is another term for an electric insulator, where electrons are not free to move from atom to atom or from molecule to molecule. Shows one of the many technological applications for dielectrics - the increase in capacitance of a capacitor when a dielectric is inserted into it.
D: Investigates by practical experiment the torques exerted on magnetic dipoles - a test coil and a bar magnet - by other magnetic dipoles - a source coil and the earth.
E: A case study of magnetic spectrometry at the Daresbury Nuclear Structure Facility, which employs very large bending magnets to direct charged ions in various experiments. This study involves the measurement of tiny concentrations of the chlorine-36 radioisotope present in geological samples.
F: Shows how electromagnets and permanent magnets are used to grasp, lift and deposit large chunks of steel at a scrapyard and ingot store at Stocksbridge Engineering Steels, Rotherham. Demonstrates the tear-off forces needed to overcome the magnatic attraction of a steel plate to an electromagnet at different electric currents. Looks at safety in the scrapyard and at the properties of a high-remanence material such as ‘alnico’, an alloy of iron aluminium, nickel and cobalt, presented as a suitable core material for an electro-permanent magnet.
Series
Electromagnetism, Course Smt356
Language
English
Country
Great Britain
Medium
Video; Videocassette. Standard formats. col. 90 min.
Year of production
1991
Availability
Sale; 1999 sale: £120.00 (+VAT +p&p)
Documentation
Accompanying booklet.
Subjects
Physics
Keywords
electromagnetism; magnets

Sections

Title
Gauss’s law and electrostatics

Title
Band A

Title
Fields and potentials

Title
Band B

Title
Dielectrics

Title
Band C

Title
Magnetic fields

Title
Band D

Title
Bending magnets

Title
Band E

Title
Grip of iron, A

Title
Band F

Production Company

Name

BBC Open University Productions

Distributor

Name

Open University Worldwide

Web
http://www.ouw.co.uk External site opens in new window
Phone
+44 (0) 1908 274066
Address
Walton Hall
Milton Keynes
MK7 6AA
Notes
NB. As of May 2016 Open University Worldwide are no longer distributing DVDs. They have posted this message on their website: ‘Unfortunately Open University Worldwide Limited has decided that product sales are no longer viable given the reduced funding to Higher Education institutions and diminishing demand for the products we have traditionally stocked. At present the Open University Students Association (OUSA) will continue to sell the "Good Study Guide", and we are in discussion with other possible distributors to continue to make The Open University’s products available for purchase. As soon as we have any information on other channels of distribution we will update this notice’. Some products are still available via second hand dealers on Amazon.co.uk

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