Magnetism

Inertia. A system will not change it's properties until an external force is applied. Permanent magnets DO decrease in strength by being used as they are subjected to external magnetic fields that oppose them. How much a permanent magnet will be affected by the external field depends on it's Hysteresis loop characteristics.

A magnetized nail is a temporary magnet, known as an induced magnet. It becomes magnetized when it comes into contact with a permanent magnet, aligning its magnetic domains in the same direction. This temporary magnetism can be lost if the nail is no longer in contact with a permanent magnet.

A magnet aligns itself along the earth's magnetic field, with its north pole pointing to a location called 'Magnetic North', so called to distinguish it from 'True North'. The magnetic polarity of the location we call 'Magnetic North' is south.

Electro magnets are used in various gadgets such as loudspeakers, MRI machines, relays, and magnetic locks. They generate a magnetic field when an electric current flows through them, allowing for their versatile applications in technology.

Yes a magnetic rock is called LodgeStone! When I was in fifth grade I did an experiment on LodgeStone with magnets. It worked with magnets

!

No, an aluminum and copper blend is not magnetic because neither aluminum nor copper are magnetic materials. Magnetism in a material is usually associated with the presence of magnetic elements such as iron, nickel, or cobalt.

Magnets have magnetic fields that extend into the space around them. When two magnets are brought close together, these fields interact with each other, resulting in a force of attraction or repulsion between the magnets. This force occurs even when the magnets are not in direct contact with each other.

Rub the iron needle along one direction on the strong bar magnet repeatedly until it becomes magnetized. Make sure to always rub it in the same direction to ensure a consistent magnetic field. This process aligns the magnetic domains within the iron needle, causing it to become permanently magnetized.

It might be possible to characterize an electric charge as a current -- if that charge is moving. Any moving charge is electricity under the fundamental definition of that term. Electricity is generally thought of as moving electrons, but a more fundamental definition of electricity is any moving charge or group of charges. If your electric charge is moving, it is electric current.

Normally nickel plating is applied to base metals that aren't attracted to a magnet. At the atomic level the plating itself is attracted but it's such a small amount of the total composition that the entire item won't stick to a magnet.

The nickel component of US nickels (and nickel-clad coins such as dimes, quarters, and half-dollars) is so low that the coins aren't attracted for the same reason. Nickel metal makes up only 25% of a nickel coin and 8% of the other coins.

The weight of a magnet does not directly affect its strength. The strength of a magnet is determined by its magnetic material, shape, and how it is magnetized. A heavier magnet may have more material in it, which could potentially make it stronger if the material used has high magnetic properties.

they attracted to their opposite poles and certain metals such as iron. their domain are aligned to give them magnetism

It points to true north.

Electricity is the movement of electrons between atoms. It is inexorably linked to magnetism (and light) - moving electrons create a magnetic field and a magnetic field will cause electrons to move in a conductor and when electrons lose energy light is created.

Either increasing the size of the current (in amps) or the number of turns of wire wrapped around the core will make a stronger magnet. A larger current will make a stronger magnet (up until too much makes the wire melt!). Increasing the voltage forces more current through the electromagnet.

Magnetic poles are the ends of a magnet where the magnetic force is strongest. There are two, north and south. The north end of a magnet would come together with the south end of another magnet. But, two like poles wouldn't. It's like when you were a kid, trying to force two magnets together, and your hands were pushed out of the way by the force.

When current is induced in the rotating coil in an electric generator then a counter couple acts on the current carrying rotating coil in the magnetic field(in accordance to the principle of dc motor). This counter couple is called back motor effect.

The temperature field map is typically a static field since it represents a snapshot of temperature distribution at a specific point in time. However, the temperature field can be dynamic if it changes over time due to factors such as heating, cooling, or air circulation.

Conductive materials like copper and aluminum are non-magnetic because they have unpaired electrons in their outer shells that do not align to create a magnetic field. The lack of alignment of these electrons makes the material non-magnetic, even though it can still conduct electricity efficiently.

Water molecules have a lopsided shape due to the bent structure caused by the unequal sharing of electrons between oxygen and hydrogen atoms. This polarity leads to the formation of hydrogen bonds, which make water act like a chemical magnet, allowing it to easily attract and interact with other polar molecules.

Yes. Exactly the same way, and described by the exact same math, as the change

in the gravitational force between masses as the distance between them changes.

We do not really know that it is impossible to have isolated north or south magnetic poles on their own, rather than coming in north-south combinations as we usually find them. Physicists believe that there may exist sub-atomic particles called monopoles which have only one pole, north or south, per particle. These have so far never been found, however.