Will 2 iron bars attract?
The iron bar and magnet attract each other. Like poles face each other. The magnet repels the iron bar.
How do you know if iron bars are magnetized?
Solution: You can hang the iron rods on a string and watch which one turns to the north (or hang just one rod). Gardner gives one more solution: take one rod and touch with its end the middle of the second rod. If they get closer, then you have a magnet in your hand.
How do I permanently magnetize my iron?
Take two magnets put one North pole and one South pole on the middle of the iron. Draw them towards its ends, repeating the process several times. Take a steel bar, hold it vertically, and strike the end several times with a hammer, and it will become a permanent magnet.
How will you identify the two iron bars of equal size as a magnet or as an ordinary iron bar?
One bar is placed flat horizontal on the table and the other bar is held vertical with its one end on the middle of first bar. If there is attraction between the two, the vertical bar is magnet otherwise ordinary iron.
What is used to differentiate between a piece of iron and a magnet?
Answer: A ferromagnetic material is a substance that can possess magnetization in the absence of an external magnetic field. The main difference between hard iron and soft iron is that hard iron cannot be demagnetized once it is magnetized whereas soft iron can be demagnetized once it is magnetized.
What will happen if a magnet is brought near a compass?
If a compass is brought near a magnet its needle gets deflected due to the magnetic field of magnet. If a compass is brought near a magnet its needle gets deflected due to the magnetic field of magnet.
What makes a compass go crazy?
If we are talking about a magnetic compass, the magnetic field sensing needle is always doing what it was designed to do, but the “malfunction” could possibly be caused by external influences, such as other interfering magnetic fields, nearby ferrous structures, even ore deposits within the earth.
Is a compass a permanent magnet?
The needle of a compass is itself a permanent magnet and the north indicator of the compass is a magnetic north pole. The north pole of a magnet will tend to line up with the magnetic field, so a suspended compas needle will rotate until it lines up with the magnetic field.
Why do compasses go crazy?
A compass is a very small magnet on a really thin point to hold it up. Well, the whole planet is a magnet too, just not a very strong one – that’s why we need the very thin stick to hold the magnet up – so it doesn’t stop it from turning in the magnetic field of the planet, to line up.
What metal renders a compass useless?
ferrous metals
What element makes a compass useless?
The strength and direction tend to “tilt” the compass needle up or down into the Earth. This causes the needle to “point” in the direction where the compass is tilted regardless of the compass direction, rendering the compass useless.
What happens if you hold a compass at the North Pole?
At the north pole, for example, if you hold the compass horizontally the needle which is supposed to point north will point south, toward the north magnetic pole.
What determines magnetic permeability?
Magnetic permeability μ (Greek mu) is thus defined as μ = B/H. Magnetic flux density B is a measure of the actual magnetic field within a material considered as a concentration of magnetic field lines, or flux, per unit cross-sectional area.
What is the difference between magnetic susceptibility and magnetic permeability?
Permeability is the measure of the resistance of a material against the formation of a magnetic field. A closely related property of materials is magnetic susceptibility, which is a dimensionless proportionality factor that indicates the degree of magnetization of a material in response to an applied magnetic field.
Do permanent magnets have high permeability?
Permeability of Hard Magnetic Materials NdFeB magnets also have a high coercive force (Coercivity) which makes it difficult to demagnetize them. It is typical then for low-permeability materials to be used as permanent magnets, and for high-permeability materials to be used as soft magnetic materials.
What type of material is suitable for permanent magnet?
Permanent magnets are made from special alloys (ferromagnetic materials) such as iron, nickel and cobalt, several alloys of rare-earth metals and minerals such as lodestone.