GEOLOGY

Detailed explanation-1: -Temporary magnets are made of soft metals that are magnetised only when exposed to a permanent magnetic field or an electric current. When they come into contact with a magnetic field, they become magnetized .

Detailed explanation-2: -An electromagnet is called a temporary magnet because it produces a magnetic field only when the current flows in its coil. The magnetic field vanishes when the current is switched off.

Detailed explanation-3: -Materials that retain their magnetism, only for a short period of time, are termed as temporary magnets.

Detailed explanation-4: -Permanent magnets are those magnets that retain their magnetism for a long period of time. Temporary magnets are those magnets that lose their magnetism as soon as the cause producing their magnetism is removed. Materials like iron, nickel, and cobalt are used for making permanent magnets.

Detailed explanation-5: -Researchers have created extremely small, thermally stable magnetic particles. These CoFe2C nanoparticles have magnetic properties comparable to some rare earth magnets, the strongest permanent magnets ever created, at sizes as small as 5 nanometers, a million times smaller than an ant.