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cheah10
- 20
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I've checked Wikipedia for answers but can't find any. I'm learning electromagnetism in school now. I don't know why this happens and so I can't understand the lessons! Can anyone tell me why? Thx :)
When an electric current flows through a wire, it creates a circular magnetic field around the wire. This is due to the movement of the electric charges, or electrons, which are negatively charged particles. As the electrons move, they create a magnetic field that is perpendicular to the direction of the current flow.
The relationship between electric current and magnetic fields is described by Ampere's law. This law states that the magnetic field strength is directly proportional to the electric current and the distance from the wire. This means that the stronger the current and the closer the distance, the stronger the magnetic field will be.
Yes, magnetic fields can also be created by permanent magnets or moving electric charges. However, in the case of a wire, an electric current is necessary to create a magnetic field.
The direction of a magnetic field created by an electric current can be determined using the right-hand rule. If you point your thumb in the direction of the current flow, then your fingers will curl in the direction of the magnetic field lines.
Magnetic fields created by electric currents have a wide range of practical applications, including electric motors, generators, MRI machines, and particle accelerators. They are also used in everyday devices such as speakers, headphones, and credit card readers.