Production of magnetic field

In summary, when a metal rod is moved in a magnetic field, an emf is induced but it does not produce a magnetic field. The emf can create current which in turn can produce a magnetic field, but only when the magnetic field is changing with respect to time. The movement of electrons is what produces the magnetic field, and for an emf to be induced, the electrons must move to one side of the rod. It is important to note that a magnetic field is only caused by current or moving charges.
  • #1
I want to ask a question about magnetic field.
If I move a metal rod in a magnetic field, an emf is induced in it,
will the emf produce a magnetic field ?
Actually, a magnetic field is produced by an electric field or a current ??
 
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  • #2
If you move a metal rod in a magnetic field, an emf is induced. But that emf does not create any magnetic field. The emf can create current and in turn current will create magnetic field. The induced magnetic field will be against the original field. That's why when you plug in loads into a DC generator, the torque will be harder.
 
  • #3
haiha said:
If you move a metal rod in a magnetic field, an emf is induced. But that emf does not create any magnetic field.

unless it is changing w.r.t. time.
 
  • #4
That means the movement of electrons produce a magnetic field ?
Can we consider that for a emf to be induced, electrons should move to one side of the rod and at this small instant, a magnetic field is produced ?
 
  • #5
Let immagine the magnetic field is infinite large, and the rod is moving for ever, so the emf is induced, but not any induced magnetic. Magnetic field is only caused by current or moving charges.
 

1. How is a magnetic field produced?

A magnetic field is produced when a current-carrying wire or a moving charged particle creates a force that can attract or repel other charged particles. This process is known as electromagnetic induction.

2. What materials can produce a magnetic field?

Materials such as iron, cobalt, and nickel are known as ferromagnetic materials and have an inherent ability to produce a magnetic field. Other materials such as copper and aluminum can also produce a magnetic field when an electric current is passed through them.

3. How can the strength of a magnetic field be increased?

The strength of a magnetic field can be increased by increasing the number of loops in a current-carrying wire, increasing the current in the wire, or by using a stronger magnet. The distance from the source of the magnetic field also affects its strength.

4. What is the difference between a permanent magnet and an electromagnet?

A permanent magnet produces a magnetic field without the need for an external power source, while an electromagnet requires an electric current to produce a magnetic field. The strength of an electromagnet can be controlled by adjusting the current, while the strength of a permanent magnet is fixed.

5. How is a magnetic field used in everyday life?

Magnetic fields have various applications in everyday life, such as generating electricity in power plants, powering electric motors, and in household appliances such as refrigerators and speakers. They are also used in medical devices like MRI machines and in transportation systems like trains and levitating trains.

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