Magnetic field and flux density

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Magnetic field and flux density

An Example Toroid Core

It is a unit of magnetic flux density. It is also equivalent to these other units: Now, 1Gauss is about 6. If you place the tip of your index finger to the tip of your thumb, enclosing approximately 1 square inch, four magnetic field lines would pass through that hole due to the earth's magnetic field!

Measuring the strength of magnets 1. Hall-Effect Devices A Hall-effect device is a piece of material which is affected by a magnetic field. By passing a constant amount of current through it in one direction, and by placing it in a magnetic field in another direction, we can measure a voltage across it in the third direction.

This voltage is proportional to the strength of the magnetic field. This can be calibrated to provide a certain mV change for every Gauss of magnetic field. This effect was discovered by Edwin Hall in The materials often used today in these devices are indium arsenide or gallium arsenide.

What can you do with a Hall-effect device? Build an electronic circuit which will amplify the voltage across the device and calibrate it so you can measure a voltage and translate that into a Gauss measurement.

For such a unit, check out the page on building a Gaussmeter.

Magnetic field and flux density

Paper clips and BB's If you don't have a way to build a gaussmeter or magnetometer in order to measure the strength of the magnetic flux density of a magnet, then what else could you do? Count how many paperclips or staples you can attach end to end from the north pole to the south pole.

Magnetic Field Strength

Count how many paperclips or staples you can attach to one of the magnet's poles. Have a big pile of paperclips or staples on the table and count how many will stick to the magnet, all over its surface.

Remove the magnet all covered with BB's, and take it to another plastic container to pull off and count the number of BB's that the magnet was able to attract to itself. Magnetometer This is a meter my brother had purchased in order to insure there was no residual magnetic field left on some equipment.

It would show polarity and magnitude. It was made by Anno Instruments in Indianapolis. It is very sensitive. The area at the bottom of the meter is placed near the magnetic field to be measured.

What appears to be a good book on this subject is: The Magnetic Measurements Handbook, by J.

Magnetic field - Wikipedia

Janicke Magnetic Research, Inc. Answers to the rod problems: Two rods It is fairly easy to determine which rod is a magnet and which is not. I suspect that if you actually had those two rods in front of you, you would be able to figure it out.

Here's a straightforward method to determine that. Let's call one rod A and the other rod B. Perhaps you could keep one in the left hand and the other in the right hand. Next, touch the end of A to the middle of B.

If it sticks, then A is the magnet and B is iron. If it does not stick, then B is the magnet and A is iron. To double check this, touch the end of B to the middle of A.What is a Tesla?

It is a unit of magnetic flux density. It is also equivalent to these other units: 1 Weber per square meter 10, Gauss (10 kilogauss). Magnetic Field Evaluation in Transformers and Inductors By Lloyd H. Dixon This topic reveals, by means of magnetic field plots, many of the problems that occur in magnetic device.

where B is the magnitude of the magnetic field (the magnetic flux density) having the unit of Wb/m 2, S is the area of the surface, and θ is the angle between the magnetic field lines and the normal (perpendicular) to S. Glossary of space and planetary related terms.

A accretion Accumulation of dust and gas into larger bodies.

Magnetic flux and Faraday's law

albedo Reflectivity of an object; ratio of reflected light to incident light. The Magnetic Flux Density is explained here. It is basically proportional to the magnetic field by the medium/material constant permeability (mu). The units are Webers/meter^2. Magnetic Field Units.

The standard SI unit for magnetic field is the Tesla, which can be seen from the magnetic part of the Lorentz force law F magnetic = qvB to be composed of (Newton x second)/(Coulomb x meter). A smaller magnetic field unit is the Gauss (1 Tesla = 10, Gauss). The magnetic quantity B which is being called "magnetic field" here is sometimes called "magnetic flux density".

Magnetic flux - Wikipedia