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There is more explanation from this link that makes me consider this to be reliable but not sure... Source.

Could this calculator be reliable?

@EdStainless, why is it not practical? Please do explain.

@waross , How so? Why can't -V(emf) be induced to resist the change of an additional field generated by the alignment of the ferromagnet's domains? And if there is a decrease in field strength that "change" induces -V to resist the change, wouldn't it? I assumed that -V can be induced only...

I have built an electromagnet that is capable of attracting ferromagnets, from a small distance. When this electromagnet attract's small pieces of iron or steel, I assume the magnetic field of the electromagnet "changes" it increases due to the piece of iron. But what is the iron's B = to?

@EdStainless, could you explain why it would be in detail? @IRstuff most of those electromagnet's forces are rated at 3000 lb + at direct contact, and 90% of that force is dropped with a gap that is 0.1"... Yet they don't consume a lot of power, I assume by increase P from 200W to 2000W the...

Is it possible to produce over 1000 lb of magnetic force over a distance of 4 inches, using an electromagnet? How difficult would it be? Explaining the general spec's of such an electromagnet? And most importantly, the most expensive part of all the power input... How much power would this...

As I increase the turns of the electromagnets, eventually more voltage is needed to maintain the same magnetic field. Thank you @IRstuff, eventually the field will become larger. But would the force change and become greater?

An electromagnet can pull with 100N on ferromagnets 0.5cm away, when r is near zero the force increases significantly, what are the possible methods of keeping that same rate of force (100N) applied over large distances over 0.5cm? Increasing the size of the electromagnet? Or applying more voltage?

What is common is an attractive electromagnet that is able to produce forces above 5,000 lb easily. However, it more difficult to generate similar magnitude of force with a repulsive force. Is it practical to build a similar spec, similar input or close to it, and generate massive repulsive...

Usually I'd find electromagnet's with the capacity of attracting(i.e holding) Fe in massive rates of force. Is it it possible to build an electromagnet that could repel( similar electromagnets) with large forces using the same materials however in a different designs?

@IRstuff Is there a specific name to this configuration? That I can research more about? I'm imagining two poles on one side, I understand that point. However, why can't the repulsive force be achieved here using an identical product? Here is why I'm confused...there is a magnetic field, and...

This is an electromagnet that has both poles on it's surface. Example . When it's surface is in direct contact to a ferromagnet it generates forces up to 480 lb. Now it's manufacture states that it's not possible to create a repulsive force... I would disagree and would ask you if this is true...

Sorry for my terrible misunderstanding, I'm not an expert in this field at all. Hence why I come here for help. This is a lift motor(i.e winch) that can carry objects over 1000 lb(load). This particular DC motor, has the potential to generate 4448 of force on objects that weight 1000 lb. Can...

A motor under no load uses 10 Amps, however at max load draws 120 Amps at 12 Volts. Usually, I would apply more voltage to the motor(without load) to increase the current. If the total input power is 1440W, and the power source is 1500W, why can't I use a step down transformer to force the...

@EdStainless The size is not an issue, any size is fine. Most important factors is the power consumption, I'm hoping it could be low.

@dgallup, What do you mean with the small regions part? Could you clarify? Can these solenoids(I assume with iron cores i/e electromagnets...) act on objects form a distance? It does not have to be fully uniform, anything about 70% will do.

Thank you for the help & reply! Im trying to achieve a powerful magnetic field that can act on "magnetic objects" 20 mm away. Size, material, etc... Does not matter. All that matters is using the least amount of power(5KW MAX) and achieving a magnetic field of 1 Tesla, + I forgot. The core...

Is this practical?

Im trying to build a powerful electromagnet with a field strength of a 1 Tesla or neat it. While planning... one concern to me is the input power required. What could be the range from? I'll be using a high permeability core that saturates beyond 1 Tesla. Is it possible? An electromagnet that...