EARTH SCIENCE
MAGNETISM
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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A magnet that always keeps its magnetism
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A magnet found in nature.
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A magnet that gives off a magnetic force for a period of time.
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None of the above
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Detailed explanation-1: -Induced magnets are temporary and can lose their magnetic nature, whereas permanent magnets cannot.
Detailed explanation-2: -Induced or temporary magnets are materials that only become magnetic when placed in a magnetic field and will only then produce their own magnetic field. Temporary magnets are made from ‘soft’ magnetic materials like iron and some iron-nickel (steel) alloys.
Detailed explanation-3: -A permanent magnet is called a permanent magnet because its magnetism is ‘always on’, it generates its own persistent magnetic field unlike an electromagnet which is made from a coil of wire wrapped around a ferrous core and requires an electric current to generate a magnetic field.
Detailed explanation-4: -An electromagnet is a temporary magnet that consists of freely traveling electric currents rather than magnetized materials. Technically, an electric current always produces a magnetic field.