If the compass needle rest in any direction at a certain point it shows that the net magnetic force acting on the point is zero. Hence, the resultant magnetic field is zero. This point is also known as null or neutral point.

The direction of magnetic field lines is defined to be the direction in which the north end of a compass needle points. The magnetic field is traditionally called the B-field. Visualizing Magnetic Field Lines: Magnetic field lines are defined to have the direction that a small compass points when placed at a location.

Drawing conclusions refers to information that is implied or inferred. This means that the information is never clearly stated. Writers often tell you more than they say directly.

Magnets are found in many devices that people use every day. They are in any machine that has a motor. That includes fans, washing machines, and cars. Motors use magnets and coils of wire to turn electrical energy into motion.

Among the following options, magnetite is the only natural magnet.

Magnetite is the material which is a natural magnet.

The crust of the Earth has some permanent magnetization, and the Earth’s core generates its own magnetic field, sustaining the main part of the field we measure at the surface. So we could say that the Earth is, therefore, a “magnet.”

The magnetic field is generated by electric currents due to the motion of convection currents of a mixture of molten iron and nickel in the Earth’s outer core: these convection currents are caused by heat escaping from the core, a natural process called a geodynamo.

When you rub a piece of iron along a magnet, the north-seeking poles of the atoms in the iron line up in the same direction. The force generated by the aligned atoms creates a magnetic field. The piece of iron has become a magnet. Some substances can be magnetized by an electric current.

Natural magnets can be found in sandy deposits in various parts of the world. The strongest natural magnet material is lodestone, also called magnetite. This mineral is black in color and very shiny when polished. The lodestone was actually used in the very first compasses ever made.

What about the Earth’s magnetic field? Magnetic fields are about organic as it gets. The earth is a giant magnet. The field streams out at the north magnetic pole, loops around the planet and returns through the south magnetic pole.

Lesson Summary. Earth is a giant magnet with north and south magnetic poles and a magnetic field called the magnetosphere. Scientists think that Earth’s magnetic field is caused by the movement of charged particles through molten metals in the outer core.

Earth’s magnetic field is mostly caused by electric currents in the liquid outer core, which is composed of conductive, molten iron. Loops of currents in the constantly moving, liquid iron create magnetic fields. From afar, the Earth looks like a big magnet with a north and south pole like any other magnet.

Also in this century, Georg Hartmann and Robert Norman independently discovered magnetic inclination, the angle between the magnetic field and the horizontal. Then in 1600 William Gilbert published De Magnete, in which he concluded that the earth behaved as a giant magnet.

There are three types of magnets: permanent magnets, temporary magnets, and electromagnets.

There are three main types of magnets: temporary, permanent, and electromagnets.

Magnet which are made from iron in different components shape and sizes for different uses are called artificial magnet. It is a magnetized piece of iron, steel, Cobalt or nickel. These magnets are of different sizes and shapes. It is used in loudspeaker, telephones, radios, television etc.

The first magnets were not invented, but rather were found from a naturally occurring mineral called magnetite. Traditionally, the ancient Greeks were the discoverers of magnetite. There is a story about a shepherd named Magnes whose shoe nails stuck to a rock containing magnetite.

The health sector is another field where neodymium magnets are incorporated in medical devices for example in magnetic resonance imaging devices to diagnose and treat chronic pain syndrome, arthritis, wound healing, insomnia, headache, and several other diseases due to their ability to generate a static magnetic field.