The lines of magnetic field from a bar magnet form closed lines. By convention, the field direction is taken to be outward from the North pole and in to the South pole of the magnet . Permanent magnets can be made from ferromagnetic materials.
What is the direction of magnetic field lines inside a magnet?
(a) The direction of magnetic field lines outside a bar-magnet is from North seeking pole to south seeking pole while inside the magnet it is from south to north seeking pole .
What direction do magnetic field lines face?
Thus, the magnetic field lines point away from the north pole of a magnet and toward its south pole . Figure 20.9 The black lines represent the magnetic field lines of a bar magnet. The field lines point in the direction that the north pole of a small compass would point, as shown at left.
Are there field lines inside a magnet?
No. The magnetic field lines (lines whose direction at each point along them is the direction of the magnetic flux density, →B, at that point) are continuous closed loops .
What is the direction of magnet?
Magnetic field lines are defined to have the direction that a small compass points when placed at a location. (a) If small compasses are used to map the magnetic field around a bar magnet, they will point in the directions shown: away from the north pole of the magnet, toward the south pole of the magnet .
How do you know if a magnet is north or south?
One easy way to tell which pole is north and which is south is to set your magnet near a compass . The needle on the compass that normally points toward the north pole of the Earth will move toward the magnet’s south pole.
Where is a magnetic field strongest?
The magnetic field is strongest at the poles , where the field lines are most concentrated.
Can you see if an object has a magnetic field?
A compass can detect a magnetic field and show its direction. Iron filings can show the shape of a magnetic field. A gaussmeter can detect a field and indicate its strength.
Where is the magnetism strongest on a horseshoe magnet?
Horseshoe Magnets
It is made by bending a regular bar magnet into a horseshoe shape. The strongest part of a magnet is concentrated at the poles . That is why a horseshoe shape is considered the strongest and can be very useful to create if you want to lift heavy objects or want to make a bar magnet stronger.
Where is the strongest magnetic field around a bar magnet?
the magnetic field lines never cross each other. the closer the lines, the stronger the magnetic field (so the magnetic field from a bar magnet is strongest closest to the poles )
Why do magnetic lines move from north to south?
When it comes to magnets, opposites attract . This fact means that the north end of a magnet in a compass is attracted to the south magnetic pole, which lies close to the geographic north pole. Magnetic field lines outside of a permanent magnet always run from the north magnetic pole to the south magnetic pole.
How do you use a compass as a magnet?
Rub one end of the needle on one side of the magnet 30 times (the north pole if your magnet is labeled). Always rub in the same direction. Flip the magnet over and rub the other end of the needle on this other side 30 times. Again, rub in the same direction.
Is an electromagnet a permanent magnet?
An electromagnet is a type of magnet in which the magnetic field is produced by an electric current. Electromagnets usually consist of wire wound into a coil. ... However, unlike a permanent magnet that needs no power, an electromagnet requires a continuous supply of current to maintain the magnetic field.
Is North positive or negative on a magnet?
On Earth, the north (positive) pole of the Earth’s magnet is in fact at its South geographic pole. A compass needle sure enough indicates North, but if you put a compass needle near a bar magnet, it points AWAY from the north (positive) pole of the bar magnet.
How can you tell an iron from a magnet?
So when we are given two identical looking magnets and iron rods, one way to distinguish between them is by the magnetism property of a magnet . Both the rods can be placed near a pin or steel rod which will be attracted by the magnet. Iron will not have any response for this.
