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How a solenoid may be used to demagnatise a bar magnet?
To demagnetize a bar magnet using a solenoid, the magnet can be placed inside a solenoid and the current can be gradually decreased to zero. This process disrupts the alignment of magnetic domains within the magnet, leading to demagnetization. The alternating current can also be used for more effective demagnetization.
Why is magnetism induced into an iron bar placed near a magnet?
When an iron bar is placed near a magnet, the magnetic field of the magnet aligns the magnetic domains within the iron bar. This alignment increases the overall magnetic field strength of the iron bar, effectively inducing magnetism in the bar.
What is the definition of magnetic keepers?
A magnetic keeper is a strip of soft iron or steel which is placed across the poles of a permanent magnet to help preserve the magnetism.
Why soloniod is used for magnetize different metals?
Solenoid is a helically wound coil of wire. If current flows through the wire then an intense magnetic field is produced along the axis of the solenoid. This magnetic field would induce magnetism in the ferro magnetic piece placed along the axis of the solenoid.
How can you determine the magnet if you have one brass rod and another magnet in space?
Cut one in half, and see if the two bits attract or repel one another. If they do, you have cut the magnet. Otherwise the rod. If you are allowed other equipment, you don't need to cut anything. Make a coil, connect to a meter, and see which rod, when pushed in and out of the coil, induces a current.
How would you describe a temporary magnet?
A temporary magnet is a material that becomes magnetic when placed in a magnetic field and loses its magnetism when the magnetic field is removed. This differs from a permanent magnet which retains its magnetism without the need for an external magnetic field. Temporary magnets are often made from materials like iron, steel, or nickel.
What happens when a nail is placed near a magnet?
When a nail is placed near a magnet, it can become magnetized due to the magnetic field of the magnet. The magnet induces a magnetic alignment in the nail's iron atoms, causing the nail to exhibit its own magnetic properties. If the magnet is strong enough, the nail may even be attracted to the magnet, demonstrating the principle of magnetism in ferromagnetic materials. Once removed from the magnetic field, the nail may retain some magnetization but will generally lose most of it over time.
Where is Reva placed an iron nail close to a magnet. What happened?
When Reva places an iron nail close to a magnet, the magnet's magnetic field induces magnetism in the nail. This causes the nail to become a temporary magnet, aligning its own magnetic domains with the external magnetic field. As a result, the nail is attracted to the magnet and will stick to it until removed from the magnetic field.
What is Gilbert experiment?
There are several experiments known as Gilbert's Experiment, but the most common is in induced magnetism. This showed that an piece of iron became temporarily magnetic when placed on a magnet. This is why sprinkled iron on a paper over a bar magnet seems (but actually does not) show magnetic lines of force. Instead the iron particles just obey Gilbert's Law of Induced Magnetism.
Why magnetism at the centre of a bar magnet is zero?
F = mB - mB =0 a bar magnet is placed in a uniform magnetic field B, its poles +m and -m experience force mB and mB along and opposite to the direction of magnetic field B.
Can a magnet be broken?
Not exactly. All pieces of the magnet retain their ferrous properties, but if they were (for example) dropped, then the shock of the fall could potentially make them lose a bit of magnetism. Extreme temperature changes and high power electric discharges could also decrease the power of the magnet.
What are materials attracted by a magnet called?
It is called the magnetic force. This is a force caused by the attraction or repulsion of the magnetic fields of the materials.
