Magnetism

The longest one does.

If you're talking about visible light, then it's the last color you can see

on the red end.

If you're talking about the electromagnetic spectrum in general, then

there's no such thing as the "lowest" frequency.

there are a lot of neodymium magnets coming from china lately.

Copper (Cu) is not attracted to magnets because it is a diamagnetic material. Diamagnetic materials create a weak magnetic field in the opposite direction of an external magnetic field, causing them to be repelled rather than attracted by magnets.

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Most bottle caps are made of steel or aluminum, which are not magnetic materials. So, bottle caps themselves do not attract to magnets. Some bottle caps may have a plastic lining that also would not be magnetic.

The bar magnet and the electromagnet act identical. The difference being a electromagnet is a coil of wire that has a power source connect to both ends, this energizes the coil with an electromagnetic field.

Every substance has the physical property of magnetism to some extent. Metals can be magnetized more than other elements or compounds.

personally I don't know ...... figure it out ur self <3

Iron is a soft magnetic material due to its unique crystal structure that allows its magnetic domains to easily realign in response to an external magnetic field. This property results in a high magnetic permeability and low coercivity, making iron well suited for applications where magnetic fields need to be rapidly and easily induced or changed.

The first modern semiconductor diode was made with germanium. These diodes were invented in ww2 for RADAR.

But before that semiconductor diodes were made with galena (lead sulfide), copper oxide, and selenium. I have no idea which was "first".

Yes, a bar magnet can attract through wood as long as the wood is not too thick or dense. The magnetic field can penetrate through materials like wood to some extent, though the strength of the attraction may be weaker compared to attracting through air.

An electrostatic charge, that is one not caused by a flow of current

Yes, 4130 steel is magnetic. It contains iron as the main element, and iron is a ferromagnetic material, which means it can be magnetized.

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The space around a magnet where its magnetic influence can be felt is called the magnetic field. It is the region in which magnetic forces are experienced due to the presence of the magnet.

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Both magnetic and electric charges interact with each other through attraction or repulsion. However, electric charges are typically carried by protons and electrons, while magnetic charges (or poles) are found in magnetic materials like magnets. Additionally, while electric charges produce electric fields that exert forces on other charges, magnetic charges produce magnetic fields that affect moving charges.

An electron is a charged particle and as such it is surrounded by an electric field. A magnet is in general not charged so it will not form an electric field. It will, however, form a magnetic field.

In case your question is what an electric field is made of, then the answer is (virtual) photons, which are the mediators for the electromagnetic force.

1. Energy is required to create a magnet, but no energy is required to maintain a magnet(magnetic field).

2. Like poles repel each other, and unlike poles attract each other.

3. The magnetic force between two poles is directly proportional to the pole strength and inversely proportional to the square of the distance between them.

When two substances are put in the same container, they do not attract each other because different substances have different intermolecular forces. If the intermolecular forces between the two substances are weak, they are more likely to mix and not separate. This is why, for example, oil and water separate in a container due to their different polarities.

Magnetic field lines. These lines represent the direction in which a small north magnetic pole would tend to move if placed at any given point in the field.

Magnetism is a fundamental force of nature that arises from the movement of charged particles, such as electrons. It is responsible for the attraction and repulsion of magnetic materials, creating magnetic fields. Materials can be classified as ferromagnetic, paramagnetic, or diamagnetic based on their response to magnetic fields.

When the poles reverse, the magnetic north and south poles switch places. This phenomenon has occurred many times in Earth's history and does not happen instantaneously. During a reversal, the magnetic field weakens, leading to potential disruptions in communication systems and navigation equipment.

If a magnetic dipole placed in a magnetic field exhibits both rotational and translational motion, it suggests that the magnetic field is not uniform. A non-uniform magnetic field will exert torque on the magnetic dipole, causing it to rotate, and may also impart a force causing translational motion. These observations can help characterize the spatial variation of the magnetic field.