# Magnet pull speed and distance

• Randoms
In summary, the conversation discusses a question about the interaction between a cylindrical neodymium magnet and a pure iron ball set on a non-magnetic stand. The magnet is approaching the ball from above and the goal is to calculate the distance at which the magnet will pull up the ball, the speed at which the ball will be lifted, and the time it will take to impact. The discussion also mentions the need to determine the magnetization of the iron ball and the net force created by the non-constant magnetic field. There is uncertainty about how to calculate these values.
Randoms
Heya,

I am new to this forum and want to start with a tricky question...

There is a cylindrical neodymium magnet, d = 40mm, height = 5 mm, hole in the middle (also round shaped cylindrical) d = 10mm.
There is also a pure iron ball d = 12mm.
The ball is set on a non-magnetic stand at 500 meters height above the sea level. The magnet approaches the ball from the above in a way that their center of mass is on the same line as where gravity pulls them. There is no vacuum so normal air is around.

How should be the following calculated?
- Distance from where the actual magnet pulls up the ball
- Speed how ball gets faster once it is actually lifted by the magnet
- Time to impact

ASCII pictures (more or less):
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Cheers :)

the analysis in this question is, find out the magnetization on the iron ball by the magnet, because if there is no magnetization, the iron ball should not get attracted by the magnet (attraction requires net magnetic moment). then find out the net force created by the non-constant B field (with respect to distance of the magnet and the iron ball) from the magnet.
No idea how to calculate this though.

## 1. How does the strength of a magnet affect its pull speed and distance?

The strength of a magnet directly affects its pull speed and distance. The stronger the magnet, the faster it will attract objects and the further away it can pull them. This is due to the greater force of attraction between the magnet and the object.

## 2. Does the size of a magnet impact its pull speed and distance?

Yes, the size of a magnet can impact its pull speed and distance. Generally, larger magnets have a stronger magnetic field and can attract objects from a greater distance. However, the shape and design of the magnet can also play a role in its pulling capabilities.

## 3. What factors influence the pull speed and distance of a magnet?

Apart from the strength and size of the magnet, the pull speed and distance can also be influenced by the type of material the object is made of, the distance between the magnet and the object, and any other magnetic fields in the surrounding area.

## 4. Can the pull speed and distance of a magnet be increased or decreased?

Yes, the pull speed and distance of a magnet can be increased or decreased. This can be achieved by altering the strength of the magnet, changing the distance between the magnet and the object, or using different materials for the object being attracted.

## 5. Is there a limit to how fast and far a magnet can pull an object?

Yes, there is a limit to how fast and far a magnet can pull an object. This limit is determined by the strength and size of the magnet, as well as the weight and material of the object being attracted. In some cases, the strength of the magnet may not be enough to overcome the weight of the object, resulting in a limited pull speed and distance.

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