Tag Archives: nib magnets

Magnetic field lines made visible

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Magnetic field lines made visible

Magnetic field lines can be made visible

Iron filings, magnetic viewing film  or ferrofluid can all make magnetic field lines visible.  Isolated readings can be also taken with gauss meters. Sure there are some nice computer graphics of predicted fields and the earth’s fields. But what about around other places such as large irregular magnets or even the earth’s magnetic field lines in your back yard for example?
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Electromagnets

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A big old electromagnet

Electromagnets don’t come bigger than this at my place. A big soft iron cored electromagnet is supporting a drill by the spade bit between the pole faces.
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Magnetohydrodynamics

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Red magnetohydrodynamic boat

Magnetohydrodynamics in a model boat

A model boat demonstrates magnetohydrodynamics. In one of its forms it gives electrical propulsion with no moving parts by applying an electric current to a fluid in a magnetic field generating thrust.  This applies to any conductive fluid including water (preferably salt), liquid metal or plasma. Here I am demonstrating the principle with water.
“Continue reading”  for further explanations and using powers up to 1 kW. 8 photos and links..
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Ferrofluid

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Ferrofluid above dual NIB magnets

A black oily magnetic liquid forms strange spikes when a magnet is applied. Ferrofluid  is a bizarre fluid that is magnetic made of nano sized magnetite particles contained in micelles in a mineral oil base.
“Continue reading” to see how much fun a dirty stain can be…
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