Exploring the Effects of Combining Small Magnets in a Cube or Sphere Shape

  • Thread starter Energize
  • Start date
  • Tags
    Magnets
In summary, when combining small magnets into a larger shape like a cube or sphere, the resulting magnetic field does get stronger. This is because the magnets are made up of tiny individual magnets, and when they are put together, they can pick up larger objects. The strength of the field depends on the volume of the magnet, not the surface area. Additionally, the formula for calculating the lifting force of a magnet on a high mu object is F=2pi M^2 A, where M is the magnetization and A is the contact area. However, this formula only applies if the magnet is large enough that the effects of the distant face can be neglected. If the magnet is too thin, the effects of the close face and distant face
  • #1
Energize
30
0
If you combine many small magnets together in a cube or spherical shape (say those 1.5 tesla rare Earth magnets), is the resulting magnetic field able to affect even heavier objects, or is there no difference in the range/energy of the field?
 
Last edited:
Physics news on Phys.org
  • #2
Energize said:
If you combine many small magnets together in a cube or spherical shape (say those 1.5 tesla rare Earth magnets), is the resulting magnetic field able to affect even heavier objects, or is there no difference in the range/energy of the field?

Well I know that the magnetic field definitely does get stronger when you make a big cube out of many small magnetised cubes because I've tried it.

Makes sense really, the domain theory says that a magnet that you can hold in your hand is just a collection of very tiny microscopic (weak) magnets all side by side, and end to end. Put them all together and you can pick up comparatively gigantic objects(compared to the size and strength of the domains) .

So yes, the more you have the stronger the field.
 
  • #3
If you build a cube out of rectangular magnets, The lifting force will be increase as the contact area of a face of the cube and the face of the object to be picked up.
In gaussian units, F=2pi M^2 A for the lifting force of a magnet of magnetization M on a high mu object, with A the contact area.
 
  • #4
clem said:
If you build a cube out of rectangular magnets, The lifting force will be increase as the contact area of a face of the cube and the face of the object to be picked up.
In gaussian units, F=2pi M^2 A for the lifting force of a magnet of magnetization M on a high mu object, with A the contact area.

So this would mean that for 2 magnets with the same volume, the one with the biggest surface-area would have the strongest field. Is that correct?
 
  • #5
Not quite. The B field just outside the magnet does not depend on the area.
The lifting force ~B times the area of contact between the magnet and the flat surface of an iron object.
One other thing. The formula I gave is only if the magnet is large enough that effect of the distant face can be neglected. If the magnet is too thin, the the effects of the close face and the distant face tend to cancel.
 

What are magnets and how do they work?

Magnets are objects that produce a magnetic field, which is a force that attracts or repels other objects made of certain materials. They work because of the alignment of electrons in the atoms of magnetic materials, which creates a magnetic field.

What are the different types of magnets?

The three main types of magnets are permanent magnets, electromagnets, and temporary magnets. Permanent magnets, such as those found in refrigerator magnets, have a constant magnetic field. Electromagnets are created by passing an electric current through a coil of wire and can be turned on and off. Temporary magnets are materials that become magnetic when placed in a strong magnetic field but lose their magnetism once removed from the field.

What are some common uses for magnets?

Magnets are used in a variety of everyday objects, such as speakers, motors, and credit cards. They are also used in medical devices like MRI machines, as well as in industrial applications for sorting and lifting metal. Magnets can also be used for fun experiments and games, such as creating magnetic sculptures or playing with magnetic putty.

Can magnets lose their magnetism?

Yes, magnets can lose their magnetism over time, especially if they are exposed to high temperatures or strong magnetic fields. This process is known as demagnetization. However, some materials, like neodymium, are more resistant to demagnetization than others.

Can magnets attract or repel other magnets through other materials?

Yes, magnets can attract or repel other magnets through certain materials, known as magnetic materials, such as iron, nickel, and cobalt. However, some materials, like copper and aluminum, are not attracted to magnets and can actually block or redirect magnetic fields.

Similar threads

Imperial-Metric Unit conversion for Magnetic Field Gradiometer?
    • Electromagnetism
Replies
2
Views
1K
Can a Toroidal Core and Hall Effect Sensor Create Transparent Permanent Memory?
    • Electromagnetism
Replies
13
Views
2K
Will Magnetic Putty Form a Cube or Sphere When Swallowing a Rare Earth Magnet?
    • Electromagnetism
Replies
1
Views
1K
I Effect of time on density distribution+shape of uniformly dense sphere
    • Mechanics
2
Replies
58
Views
2K
Plasma thruster - plasma instability in magnetic nozzle
    • Aerospace Engineering
Replies
1
Views
1K
Can a Permanent Magnet Hoverboard Work on a Magnetic Floor?
    • Electromagnetism
Replies
1
Views
1K
Understanding the Coaxial Inductor: A Study of its Electric and Magnetic Fields
    • Electromagnetism
Replies
1
Views
1K
Help with electromagnetic musical instrument design
    • Electromagnetism
Replies
14
Views
2K
What is the Definition and Function of a Magnetic Field?
    • Electromagnetism
Replies
1
Views
1K
Central Magnetic Force between Earth and Moon
    • Electromagnetism
Replies
1
Views
3K

Hot Threads

Recent Insights

Back
Top