An electromagnet's magnetic field can be turned on and off by controlling the electric current flowing through it, while a permanent magnet's field is always present. An electromagnet can have both a north and south pole, depending on the direction of the electric current.
No, graphite in a pencil is not magnetic. Graphite is a form of carbon and does not possess magnetic properties.
No, black onyx is not magnetic. It is a type of quartz with a smooth and shiny appearance, but it does not possess any magnetic properties.
No, lime is not magnetic. Lime is a type of calcium compound that does not possess magnetic properties.
Not everything possesses a magnetic field. Materials that have magnetic properties, such as iron, nickel, and cobalt, can generate a magnetic field. Other materials, like wood or plastic, do not have magnetic fields.
Maxwell predicted that electricity and magnetism group together to form a electromagnet wave traveling through space. He also predicted that the resulting electromagnet wave did not require a medium for transmission, and traveled at the speed of light.
Electromagnets possess a magnetic field that is a result of electrical current. When the current stops, the field will disappear also and hence we say that it is not permanent magnet. Magnetism is usually described as a result of one of three circumstances. It is a general law of physics that a magnetic field is created any time there is an electrical current. This is the way an electromagnet works. The so-called permanent magnets have a magnetic field that originates in the magnetic properties of the atoms that comprise the magnet and depends on the type and arrangement of the atoms. One can say the magnetism is a consequence of the material itself. Lastly, when electric fields are changing, such as in an AC circuit, magnetic fields are created as a consequence of the changing electric fields. This too is one of the basic laws of electromagnetic theory and a law of nature. This is not an effect that is easy to see, even in a laboratory setting, but it has important consequences which would take an explanation that goes outside of the topic of the current question.
No, radon is not magnetic. It is a radioactive gas and does not possess any magnetic properties.
No, kyanite is not magnetic. It is a naturally occurring mineral that does not possess magnetic properties.
Dolerite is not naturally magnetic. It does not possess magnetic properties on its own.
No, graphite in a pencil is not magnetic. Graphite is a form of carbon and does not possess magnetic properties.
No, sapphire is not magnetic. Sapphire is a type of corundum mineral composed of aluminum oxide, which does not possess magnetic properties.
No, silica is not magnetic. It is a chemical compound composed of silicon and oxygen and does not possess magnetic properties.
No, black onyx is not magnetic. It is a type of quartz with a smooth and shiny appearance, but it does not possess any magnetic properties.
No, lime is not magnetic. Lime is a type of calcium compound that does not possess magnetic properties.
Alpin is not a naturally magnetic substance. It is a mineral that belongs to the garnet group and does not possess magnetic properties on its own.
Not everything possesses a magnetic field. Materials that have magnetic properties, such as iron, nickel, and cobalt, can generate a magnetic field. Other materials, like wood or plastic, do not have magnetic fields.
Maxwell predicted that electricity and magnetism group together to form a electromagnet wave traveling through space. He also predicted that the resulting electromagnet wave did not require a medium for transmission, and traveled at the speed of light.