Magnetic fluid

Published February 14, 2021

Magnetic fluid

People have long tried to obtain magnetic fluids by shaking fine powders of ferromagnetic material in water, oil and other liquids. But such a magnetic fluid disintegrated, and the powder settled: it was too large and heavy. Only in the 60s. XX century the ferrite powder was ground so well that, being poured into a mixture of kerosene...

Amber and electricity

Published May 29, 2021

Amber and electricity

Since ancient times, people have identified amber and magnet. It would seem, what is common between a piece of fossilized resin of prehistoric trees and a magnet that is completely different from it? Quite simply, their general ability to attract objects. The property of amber to attract small and light objects was first described by the famous Greek philosopher Thales from the city of Miletus...

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