Electromagnets can be created by wrapping a wire around an iron nail and running current through the wire. The electric field in the wire coil creates a magnetic field around the nail. In some cases, the nail will remain magnetised even when removed from within the wire coil.

The correct option is C) Soft iron. Soft iron is selected for making the core of an electromagnet because the core is used in a solenoid for the production of the strongest magnetism.

Iron

The strength of an electromagnet can be increased by increasing the number of loops of wire around the iron core and by increasing the current or voltage. You can make a temporary magnet by stroking a piece of iron or steel (such as a needle) along a permanent magnet.

A simple electromagnet consists of a coil of wire wrapped around an iron core. A core of ferromagnetic material like iron serves to increase the magnetic field created. The strength of the magnetic field generated is proportional to the amount of current through the winding.

Retentivity: A measure of the residual flux density corresponding to the saturation induction of a magnetic material. In other words, it is a material’s ability to retain a certain amount of magnetization when the magnetizing field is removed after achieving saturation.

Complete answer: The steel retains the magnetic field effect longer than the aluminum, steel, nickel and soft iron and therefore steel has the highest retentivity of the substance among the following given substances.

A magnetic monopole does not exist. Just as the two faces of a current loop cannot be physically separated, magnetic North pole and the South pole can never be separated even on breaking a magnet to its atomic size.

In physics, when we have two, opposite charges or poles connected together, we call it a dipole, but when we have one by itself, we call it a monopole. Gravitational and electric “charges” and their forces. Gravitational monopoles are easy: it’s just a mass.

Magnetic monopole, hypothetical particle with a magnetic charge, a property analogous to an electric charge. As implied by its name, the magnetic monopole consists of a single pole, as opposed to the dipole, which is comprised of two magnetic poles.

Why there are no magnetic monopoles. The electron doesn’t have an electric field, it has an electromagnetic field. So it doesn’t have an electric charge, it has an electromagnetic charge. There are no magnetic monopoles because of the screw nature of electromagnetism, which is all about twist and turn.

To our knowledge, it is not possible to produce a permanent magnet with only a single pole. Every magnet has at least 2 poles, a north and a south pole (see FAQ about north pole). The existence of magnetic monopoles itself does not contradict current popular theories.

Electrons and protons are electric monopoles, though we don’t usually refer to them that way. This means they have a single charge, with protons being a positive monopole, and electrons being a negative one. In our everyday experience, electrons and protons (and neutrons) tend to be bound together into atoms.

The magnetic monopole problem, sometimes called the exotic-relics problem, says that if the early universe were very hot, a large number of very heavy, stable magnetic monopoles would have been produced. These theories predict a number of heavy, stable particles that have not been observed in nature.

1 : a single positive or negative electric charge also : a hypothetical north or south magnetic pole existing alone. 2 : a radio antenna consisting of a single often straight element.

But if we’re talking about the observable Universe, and we know we’re only able to access somewhere between the last 10-30 and 10-35 seconds of inflation before the Big Bang happens, then we know the observable Universe is between 17 centimeters (for the 10-35 second version) and 168 meters (for the 10-30 second …

These magnets are a flat surface type with the Positive pole (South) on one flat side, and the Negative pole (North) on the opposite flat surface. The Positive side (South) is usually marked with a RED color. The Negative (North) is usually indicated by a GREEN or BLUE colored-coded sticker.