Q:When a paramagnetic material is in an external magnetic field is it attracted towards the source or the sink of the external field? or is it niether

It is not exactly attracted nor repelled. When a paramagnetic material is in an external magnetic field it appears an induced magnetic field inside the material with the same sense that the external field. That makes a stable configuration from an energetic point of view. We can say than the paramagnetic material feels attraction by the external magnetic field. On the contrary, when a diamagnetic material is in an external magnetic field it appears an opposite induced magnetic field inside the material that makes a instable configuration from an energetic point of view. We can say than the diamagnetic material feels repulsion by the external magnetic field. The extreme case of a diamagnetic material is a superconductor that really avoids the magnetic field penetrate inside. That's make superconductor levitates by Meisner effect. Also you can make graphite to levitate because graphite is a very diamagnetic material. Bye.

Q:Which material is easily demagnetizable available in market that can be used for electromagnet?

cheapest and easiest will be iron!

Q:can you explain why we use magnetic wave to write data? what is the relevancy to the computer data?

HDDs record data by magnetizing ferromagnetic material directionally, to represent either a 0 or a 1 binary digit. They read the data back by detecting the magnetization of the material. A typical HDD design consists of a spindle that holds one or more flat circular disks called platters, onto which the data is recorded. The platters are made from a non-magnetic material, usually aluminum alloy or glass, and are coated with a thin layer of magnetic material, typically 10–20 nm in thickness — for reference, standard copy paper is 0.07–0.18 millimetre (70,000–180,000 nm) thick[7] — with an outer layer of carbon for protection. Older disks used iron(III) oxide as the magnetic material, but current disks use a cobalt-based alloy

Q:what material keeps electrons from moving?

I believe the term should be drifting. Electrons are constantly moving around the nucleus of an atom. In some materials the outer valence electrons are loosely held and can be made to drift from atom to atom. These materials are primarily metals This drift is called an electrical current. A material that has its valence electrons tightly held won't allow the electrons to drift. The electrons still move around the nucleus of the atom but don't drift to adjacent atoms. Such a material is called an insulator.

Q:What formula do I use to find out the magnetic strength of a magnetic material while it has contact with an electromagnet? For example, I used a cow magnet (the bar) and had a metal ring that clung to it. When I touched the ring to another object, it attracted it, but at a weaker magnetic cling. If you have an electromagnet and touch a metal wire, does the magnetic cling distribute among the entire wire evenly and does it become weaker? Thanks for your help.

Its Simple. Kill The Batman.

Q:name the elements that are magnetic.

I really think they need to be inside the camper with you.

Q:How to increase magnet magnetism?

With the increase of magnetic and porcelain!4 improve magnetic particle content.5 add winding to electrify to increase magnetism.6, increase the line and increase the number of turns of the electromagnet coil, winding the number of coils, the more the better!7 or increase the current to see.

Q:CD-ROM recording information principle, specific points, why not use magnetic material?

To say this, we must first say the principles of modern information recording.There are two kinds of modern information recording, digital record and analogue record.A typical analog storage is the voice information recording tape, magnetic tape is continuous, is equivalent to the waveform to voice the tape, after the head reads magnetic intensity, waveform amplification, output is sound.

Q:Is it good for your body to wear a magnet (magnetic) bracelet for a long time?

In fact, it is not recommended to take such things, these bracelets are those manufacturers just preach, not what the scientific basis, the human body is the biological magnetic field of its own, but is very weak, the bracelet is common with magnet magnet, more is a permanent magnet with strong magnetic field, their properties and arrangement the body is completely different, it will interfere with the body's normal magnetic field, magnetic field and magnetic field of natural human is consistent, in the forced disturbance, the consequence is the best way to sleep as can be imagined, when the head and feet toward the north and south, with the earth's natural magnetic field

Q:I‘m seeing a million sites by devoted hobbyists and I thought it would be interesting to make one for myself. The problem with the web sites? they only say what people want to do w/ them. Not how to build the working model.

a real coilgun makes use of distinctive coils and pulses the flexibility to them with timing that maximizes velocity, additionally reversing polarity so as that the gorgeous tension variations to repulsive after the projectile passes a coil. .