Power from repelling magnets

[sm0ky2]

I cannot measure the strength of the force with compass.

You can measure deflection
Which is proportional to field strength at a given distance

[ayeaye]

You can measure deflection
Which is proportional to field strength at a given distance

I don't quite understand what do you mean. I need to measure a force on the disk, in the direction of rotation. Rotation can only be in one direction, or in the opposite direction.

My spring scales have not yet arrived, do they need two months to arrive from china?

[sm0ky2]

The strength of a magnetic field decreases with the square of the distance
If distance is the same, it requires a certain amount of force to deflect the needle
the degree of deflection is directly proportionate to the force, at that distance.
It is an arbitrary proportion, like the rubberband.
Unless you know the moment of inertia of the needle on the substrate.


If your goal is to measure the difference between one side of the field vs the other
This is the best and most accurate tool for the job.


With the disk set-up,
You are working with the leverage of the radius from the fulcrum (bearing)
this is not the same as the linear force.
You will get a measurement, but what are you measuring?




You can also make a vertical set-up, where-in the force measured is a function of
the time derivative of gravity. (stationary gravitational force) E= MGH


It doesn't have to be direct vertical repulsion
You can use the lift or pull force of a known mass on a string
either wrapped around a shaft or using a pulley, or eye-ring

[ayeaye]

With the disk set-up,
You are working with the leverage of the radius from the fulcrum (bearing)
this is not the same as the linear force.
You will get a measurement, but what are you measuring?

I'm going to measure the tangent force at the distance from the center of the disk equal to the distance of the center of the nut, or another iron object on the disk, from the center of the disk. As it is a tangent force, it may be in practice considered that it is the same as a linear force.

I'm also going to measure the distance from one place the force was measured, to another, in millimeters. How can i measure the distance in millimeters, in spite it is not linear? Again, it's the distance in millimeters moved on the circle, where is the center of the nut, or another iron object.

[ayeaye]

My spring scales arrived. This one is 1 Newton, can measure very weak forces. It did cost $2.85 from ebay. I also got another, 5 Newtons, i really wanted 10 Newtons or greater, but these were the cheapest ones i could get.