Does Increasing The Size Of A Magnet Affect Its Strength

Njguy

If 2 magnets accept the same Gauss on identical faces in surface expanse, but i of the magnets is thicker, is the thicker i stronger? Will the Gauss of the thicker magnet accept more room to increase every bit a ferrous textile is brought shut to it?

MrAl

Hello there,

If one magnet is thicker than the other but ane has a higher Gauss reading at the same betoken in front end of the magnet face up and then that would have to hateful that the materials they are made of are different or somehow one is more magnetized than the other assuming both materials are homogeneous. But in any case, the reading obtained at a given indicate in space is due to every microscopic contribution from inside the magnet, and then to get that reading the entire bulk of the magnet has to have already been taken into account which means nothing is going to make it stronger other than doing something to the material like subjecting information technology to a stronger magnetic field to magnetize it or adding more than material to the bulk with the same level of magnetization.

Some materials have higher residuum magnetism than others so they make stronger magnets. Of form a stronger magnet can be smaller than a weaker magnet and accept the same pull force.

Njguy

Thanks. Just to analyze considering i may non have stated it correctly, gauss is the mensurate of the strength of a magnet. And then if you have two magnets if equal gauss but 1 is thicker, they are still the same in strength?

MrAl

Hi,

Well for a given signal in space if they accept the same field there then they have the aforementioned 'strength' there. But when we have different shapes it does get a trivial catchy because we take to have every point within the magnet into account, and that means that as an object is approaching the forepart face up of the magnet a dissimilar thickness magnet will accept a slightly different effect on all the points of the object. So nosotros have to at to the lowest degree specify a altitude for the object. The strength is measured as the pull strength, and equally an identical object nears the front face up of both magnets we'll see different forces, and that's because a larger role of the thicker magnet is 'behind' the front confront while near of the thinner magnet mass is very close to the face.

So an approximate model would exist to model the thin magnet as a unmarried thin surface with some given strength as measured at a known distance, and model the thick magnet as two thin surfaces one slightly behind the other. In order for both composite 'magnets' to accept the same strength at a given indicate out in front of them, the two surface magnet would have to have a fabric that is not as magnetized as the single surface magnet. That's because the two surfaces 'strengths' add together upward at the betoken of interest differently.

For example, lets say that at a distance of 1 inch nosotros have equal force at a point on the object with both the unmarried surface magnet and the dual surface magnet. If nosotros then move the object closer to the single magnet we see a change in force of about 1.235, while we come across a change in force of the two surface magnet of most 1.223 (same small distance moved about 0.ane inch). Not much divergence, but now the single surface magnet looks stronger when before they exerted the aforementioned strength on the object. We again assumed that the magnetization of the dual magnet is less than the single magnet as that is how nosotros got them both to exert a pull strength that was equal at a distance of 1 inch.

But if in a given application if both magnets exert the aforementioned strength, and then they accept the same strength.

Did you have some specific reason you needed this information?

dr pepper

They use lifting magnets on a jib here at work, they can lift 4 tonnes at a minimum thickness, a graph on the side shows lifting capacity versus thickness, capacity is derated correct down at the thinner end.

MrAl

Howdy there dr pepper,

You brought up an interesting point. If we accept two magnets made out of the aforementioned material and the material is magnetized the aforementioned, yet one magnet is thicker than the other, the thicker magnet will be stronger. That's of class because at that place is more than cloth there to human action on an object out in front of the magnet.
But there's a limit to the effectiveness of this because the particles at the dorsum of the magnet are further away from the object than the particles at the front of the magnet, so if the magnet is too thick the effect from the particles on the back will be much less than those on the front, and that of form ways that the strength does not increase as much. So a magnet that is 2 inch thick compared to a magnet that is i inch thick, the two inch magnet will be stronger. But comparing a 10 inch thick magnet to an 11 inch thick magnet (same difference in thickness) the 11 inch magnet is only slightly stronger than the x inch magnet forth the same management (object out in forepart).

dr pepper

I had to concentrate reading that, just aye I concord, the effectiveness of the forces does not driblet off linearly, increasing thickness is effective up to a point, then increasing by magnitudes makes little deviation.

Does Increasing The Size Of A Magnet Affect Its Strength

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