When did humans start using round magnet?

Humans have been using magnets for thousands of years, but the first round magnets were not used until the 19th century. The earliest known use of round magnets dates back to 1820, when French physicist Andre-Marie Ampere discovered that a round magnet could be used to create a magnetic field.

The first round magnets were made of iron and were used to create a magnetic field. This magnetic field could then be used to power machines, such as electric motors. The round magnets were also used to create compasses, which were used for navigation.

In the late 19th century, round magnets were used in the development of the telephone. The round magnets were used to create a magnetic field that could be used to transmit sound waves. This allowed people to communicate over long distances.

In the early 20th century, round magnets were used in the development of the radio. The round magnets were used to create a magnetic field that could be used to transmit radio waves. This allowed people to listen to music and news from around the world.

In the mid-20th century, round magnets were used in the development of the television. The round magnets were used to create a magnetic field that could be used to transmit television signals. This allowed people to watch television programs from around the world.

Today, round magnets are used in a variety of applications. They are used in the production of electric motors, generators, and transformers. They are also used in the production of medical equipment, such as MRI machines. Round magnets are also used in the production of computer hard drives and in the production of magnetic recording tapes.

Round magnets have come a long way since their first use in 1820. They are now used in a variety of applications and have become an essential part of modern life.