Find magnetic field from temporary magnet

In summary, the conversation discusses the difficulty in finding the formula for calculating the magnetic field strength from a temporary magnet and the force between two objects, one being a magnet and the other being a piece of iron. The equation ##F=\frac{KBH}{d^2}## is mentioned, but it is not clear how to find the magnetic field of 'H' or the magnetic field of the iron. It is suggested to approximate the magnetic field of the second magnet by assuming it has the same strength as the field at its place without the magnet.
  • #1
SirHall
22
1
What I've not been able to find after literally spending several hours researching is if you can find the formula to find the magnetic field strength from a temporary magnet. Or, to be put in better terms, what would be the force between two objects if one is a magnet and the other is something like a piece of iron? I've found ##F=\frac{KBH}{d^2}##
Where:
F = Magnetic Force
K = Magnetic Permeability
B = Magnetic Field
H = Second Magnetic Field

What I haven't been able to find however is how to find the magnetic field of 'H', or the magnetic field of the 'iron'.
Thanks for answers
 
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  • #2
It is complicated. To get some rough approximation, you can assume that the second magnet will produce a magnetic field as strong as the field at its place without the magnet.
 
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  • #3
mfb said:
It is complicated. To get some rough approximation, you can assume that the second magnet will produce a magnetic field as strong as the field at its place without the magnet.
Thanks, and if it's not too much to ask, would there be a way to approximate or find that?
 
  • #4
Approximate what, the field from the magnet at that point? If the distance is large enough, you can approximate your magnet as a dipole and use the formula for dipoles.
 

1. How do you find the magnetic field from a temporary magnet?

To find the magnetic field from a temporary magnet, you can use the formula B = μ0 * (magnetization * N/L), where B is the magnetic field, μ0 is the permeability of free space, magnetization is the magnetic dipole moment of the magnet, N is the number of turns in the coil, and L is the length of the coil. This formula is known as Ampere's law.

2. What factors affect the strength of the magnetic field from a temporary magnet?

The strength of the magnetic field from a temporary magnet is affected by the material and shape of the magnet, as well as the distance from the magnet and the orientation of the magnet's poles. Additionally, the number of turns in the coil and the length of the coil can also impact the strength of the magnetic field.

3. How does the direction of the magnetic field from a temporary magnet change?

The direction of the magnetic field from a temporary magnet follows the right-hand rule, where the thumb represents the direction of current flow and the fingers represent the direction of the magnetic field. As the magnet moves or is rotated, the direction of the magnetic field also changes.

4. Can the magnetic field from a temporary magnet be measured?

Yes, the magnetic field from a temporary magnet can be measured using a magnetic field sensor or a gaussmeter. These devices can detect and measure the strength and direction of the magnetic field at a specific location.

5. How does temperature affect the magnetic field from a temporary magnet?

The magnetic field from a temporary magnet can be affected by temperature. As the temperature increases, the atoms in the magnet vibrate more, causing the magnetic domains to become disordered and weakening the overall magnetic field. This effect is known as the Curie temperature, and it varies depending on the material of the magnet.

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