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Does the earths magnetic pole match the pole of a bar magnet at all times?
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Making a magnet with another magnet?
if you have a magnet and a magnetic matereal, rub the magnet from one end of it to the other. do this several times and it will eventualy be a magnet.
How are the uses of an electromagnet different from those of a permanent bar magnet?
A bar magnet is made from magnet materials and has a magnetic field at all times. An electromagnetic is not naturally magnet and only has a magnetic field when electricity is passed through it.
How does iron become magnetic?
Iron is a magnetic material, which means that it can be attracted by magnets. To make it become magnetic so as to attract other objects (i.e. to function as a magnet), the process of magnetic induction can be used. This can involve stroking the iron rod with a magnet several times (e.g. 20 times) in a fixed direction.
Can you charge steel with a magnet and can the steel have a temporary magnetic field?
If we take a steel nail and tap it with a magnet in the same way a bunch of times, the magnet will align some of the magnetic domains in the nail. The nail will then have become a permanent magnet. The magnetic strength of the nail will not be great like the magnet that created it, but it will be present and will be permanent. The nail could then be used to pick up iron filings just as the magnet could be used to do that.
What happens when you stroke a needle 20 times with a magnet?
it becomes magnetic :)
What is directional properties of a magnet?
The directive property of magnetism states that when a magnet is suspended in air, it's N and S (north and south) axis's will remain in the same direction as the earths magnetic meridian. I.e. It will continuously point north and south. If you were to mark one side red and one side blue and spin the magnetic 6 times it would still resort back to the original direction it was in.
Does the earths magnetic field has periodically reversed direction?
Yes. In historical times , clay pots have shown that the earth's magnetic field has reversed.
What do bands of rock on the seafloor showing alternating magnetic orientation indicate about the earths magnetic field?
They indicate that the Earth's magnetic field has undergone shifting of the positions of it's poles several times in the past.
Earths magnetic poles reverse approximately every years?
The process of the reversal of the Earth's magnetic poles is called a magnetic flip. This occurs every 4 or 5 times per million years.
Why are the poles of a bar magnet not situated at the extreme ends of the magnet?
The poles are situated at the ends of the bar magnet. The magnetic lines of force run through the magnet, emerge from one end, fold back around the length of the bar of the magnet, and curl back into the other end. The ends are the magnetic poles, and the magnetic lines of force emerge from one and re-enter the magnet at the other. You can see these lines by laying flat a piece of smooth paper over the magnet and sprinkling iron filings over the paper. Because they are light they will be easily moved into alignment by the magnetic field and will visually show the fields arrangement. (Using a piece of paper makes it easy to tidy up. Without it, the filings will stick to the magnet and be difficult to remove.)
How can you magnetise a needle?
There are several ways. 1. Stroke the needle in one direction, with another magnet. 2. Place it in a coil of wire and pass a large (DC) current through the coil for a few seconds. (This is how they would do it commercially) 3. Align the needle with the magnetic north/south direction, now hit it several times. It will eventually take on the earths magnetic field as it's own.
Who found magnet?
no
