# In layman's terms , how strong is a 3 Tesla Magnet?

• Tech2025
In summary, a 3T MRI machine produces a very strong magnetic field, much higher than the surface magnetic field of a neodymium magnet. The pulling force of a magnetic field depends on its geometry, but a 3T magnetic field can produce a pulling force of 522 PSI, which is 9 times stronger than a 1.5T magnet. This is comparable to the force of an automobile tire on the ground, which can cause serious injury if one's foot gets caught.
Tech2025
I saw a post where someone was granted access to a 1.5 Tesla MRI. After some research I discovered a 3 Tesla MRI. How strong is this magnet?

3T is a very strong magnetic field, and dangerous if you have anything magnetic nearby. This many times higher than the surface magnetic field of a neodymium magnet.

To answer your question, it is important to distinguish between a magnet and a magnetic field. A magnet is an object that has a magnetic field around it. A small magnet can have the same surface magnetic field as a large one, but a large one will have a much higher pulling force over a much larger distance. So, the pulling force of a magnetic field depends on the geometry of the magnetic field. That said, an MRI machine can produce frighteningly strong fields.

berkeman
Tech2025 said:
How strong is this magnet?

Twice as strong as 1.5 T!

Seriously, what kind of answer are you looking for?

A magnet that produces a 1 T field will pull 58 PSI on a steel surface. That's pounds per square inch of pole area contacting the surface. It is very roughly the strength of a neodymium iron boron magnet in contact with a thick piece of steel. A neo magnet of size 1" X 2" X 2" is too strong to safely hold in your hand if there is any steel or other neo magnets nearby.

The pull force is proportional to the square of the field strength, so a 3 T magnet will pull 9 X 58 = 522 PSI.

I had to study up on this some years ago when I designed an electromagnet to pull 1600 lbs force through a 1/4" air gap. And was amazed when it actually worked according to the calculations.

Tech2025 and berkeman
jrmichler said:
so a 3 T magnet will pull 9 X 58 = 522 PSI.
For comparison: An automobile tire puts a few tens of psi on the ground to support the weight of the automobile - and you will be going to the emergency room with some broken bones if you get your foot caught between the tire and the ground. This magnet is doing ten times that.

## 1. How strong is a 3 Tesla magnet compared to other magnets?

A 3 Tesla magnet is significantly stronger than a typical refrigerator magnet, which has a strength of about 0.01 Tesla. It is also stronger than an MRI magnet, which ranges from 0.5 to 2 Tesla. However, it is not as strong as some industrial magnets, which can have strengths up to 10 Tesla.

## 2. What does "3 Tesla" actually mean?

"3 Tesla" refers to the strength of the magnetic field produced by the magnet. It is a unit of measurement for magnetic flux density, with 1 Tesla being equivalent to 10,000 gauss.

## 3. How does the strength of a 3 Tesla magnet affect its uses?

The strength of a 3 Tesla magnet allows it to be used in a variety of applications, such as in MRI machines, particle accelerators, and research experiments. Its strength also allows for more detailed and accurate imaging in medical diagnostics.

## 4. Can a 3 Tesla magnet be dangerous to humans?

Yes, a 3 Tesla magnet can be dangerous to humans if not used properly. The strong magnetic field can attract metal objects and cause them to fly towards the magnet, potentially causing harm. It can also interfere with electronic devices and implants, such as pacemakers.

## 5. How is the strength of a 3 Tesla magnet achieved?

The strength of a 3 Tesla magnet is achieved by using stronger and more powerful magnets and increasing the number of coils in the magnet. This creates a stronger and more uniform magnetic field. Additionally, the materials used in the magnet, such as superconducting materials, also contribute to its strength.

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