Van de Graaff device and common sense in physics ….
The working principle for Van de Graaff device is analyzed again in this material:
http://elkadot.com/index.php/en/books/electromagnetism/van-de-graaff-deviceThe actual explanation contradicts all we know about triboelectricity. It is impossible for the same belt to come into contact with two identical rollers and to deliver a positive charge to a sphere and a negative charge to another sphere. Either triboelectric series, either actual explanation for VDG device is nonsense.
More than that, it is impossible to transfer a same type of charge from a body carrying a smaller charge to another body carrying a greater charge. Therefore the maximum charge accumulated on spheres should be equal with amount of charge generated in contact or friction process. Actual physics it is not able to explain how is possible to accumulate a huge charge on the sphere during belt rotation in contradiction with all known concepts of physics.
The Van de Graaff device with a charge injection system does not need any comment. Why don’t we inject directly the charge over the sphere and arrive to billions of volts and it is preferred to inject it on a belt and carried further by the belt…..?
The old material is still available as pdf file on the site and in fact the new material is only a refined presentation of it.
Best regards,
Sorin Cosofret
