Electromagnets are useful for lifting and moving large metal objects containing iron. When current runs through the solenoid coils, it creates a magnetic field that attracts the metal objects. Turning off the current turns off the magnetic field so that the metal can be easily dropped in a new place.
What is electromagnetism?
- In 1820, Danish physicist Hans Christian Oersted observed a magnet move in the presence of an electric current.
- Oersted hypothesized that the electric current had produced a magnetic field. Later experiments confirmed his hypothesis, demonstrating the relationship between electricity and magnetism.
- Electromagnetism results when electric currents and magnetic fields interact with each other.
Transistor (BC 548)
9V DC Battery
How can you make a magnet using current?
- A coil of wire that carries an electric current, and therefore produces a magnetic field, is called a solenoid. The more loops, the stronger the magnetic field.
- Wrapping a solenoid around an iron core makes an electromagnet, which combines the magnetic field of the solenoid with the magnetic field of the magnetized iron core.
- Adding loops to the solenoid or increasing the electric current strengthens the electromagnet.
What are some uses for electric magnets?
- Powerful electromagnets can raise a maglev train above its track. Just as poles of a bar magnet repel each other, electromagnets in the train and track repel each other when the electric current is turned on.
- Electromagnetic Lift are used In Rescue operations.
- The indicator on a galvanometer shows current direction and strength.
- A galvanometer is a meter that measures the strength and direction of an electric current in a wire.
- A galvanometer contains an electromagnet between the poles of a permanent magnet. When current is applied to the electromagnet, the two magnetic fields interact and cause the electromagnet to turn.
- The indicator, attached to the electromagnet, moves to one side of the zero on the scale, indicting the strength and direction of the current.
- The Electromagnetic Lift built and tested successfully.