Physics problems

let us say that there is a coil of copper hanging from the ceiling so that its radius is parallel to the ceiling and its height perpendicular.  let's also say that there is a current going through the coil such that the magnetic force inside the coil points upward.  now let's say that an iron bar with the same height of the coil is suspended inside, held up by the magnetic force.  there are m tethers attaching the coil to the iron bar radially, evenly spaced throughout the height of the coil.  what is the force on tether k < m and the force on the first k tethers?

Are the tethers conductive?

Are the tethers conductive?

No, but feel free to make them so if you want.

I think calculating the magnetic field is possible, but I am not sure how to calculate the force of repulsion when two magnetic fields are interacting with oneanother. Just wondering, did this problem come from a textbook?

I think calculating the magnetic field is possible, but I am not sure how to calculate the force of repulsion when two magnetic fields are interacting with oneanother. Just wondering, did this problem come from a textbook?

Generally, magnetic fields add together.  This problem is the result of my brain thinking too much about stuff.

The vector summation of magnetic and electric fields was covered in the physics courses I took at uni, but that vector summation technique was not connected to how to calculate force of repulsion. I think calculating force of repulsion is possible, but it is probably more complex than finding the superposition of two or more fields. There may be some empirical formulas but I can not say for sure without research.

What is happening here? Am I over thinking this, why does this work?

What is happening here? Am I over thinking this, why dies this work?

That's an awesome science demo!

She's using the chopstick to break the surface tension of the water so it doesn't form droplets in the air and spill randomly.

Pouring something slowly is difficult because the water sticks to the surface around the lip of the container. Eventually the drop of water it gets too heavy and it falls into the air. When you pour things quickly the water doesn't have time to get stuck to the side of the container you're pouring from because the angle is too steep for water to stick to the edges.

Here, I made a diagram

FISHMé TIPPED 314 CORAL FOR THIS POST

Quote from: Fishmé on May 21, 2025, 09:47:17 pm

What is happening here? Am I over thinking this, why dies this work?

That's an awesome science demo!

She's using the chopstick to break the surface tension of the water so it doesn't form droplets in the air and spill randomly.

Pouring something slowly is difficult because the water sticks to the surface around the lip of the container. Eventually the drop of water it gets too heavy and it falls into the air. When you pour things quickly the water doesn't have time to get stuck to the side of the container you're pouring from because the angle is too steep for water to stick to the edges.

Here, I made a diagram

i wonder if this is the reasoning behind turbulators.

Quote from: rachel on May 22, 2025, 02:51:51 am

Quote from: Fishmé on May 21, 2025, 09:47:17 pm

What is happening here? Am I over thinking this, why dies this work?

That's an awesome science demo!

She's using the chopstick to break the surface tension of the water so it doesn't form droplets in the air and spill randomly.

Pouring something slowly is difficult because the water sticks to the surface around the lip of the container. Eventually the drop of water it gets too heavy and it falls into the air. When you pour things quickly the water doesn't have time to get stuck to the side of the container you're pouring from because the angle is too steep for water to stick to the edges.

Here, I made a diagram

i wonder if this is the reasoning behind turbulators.

What's a turbulators

turbulators are in short used to break up laminar flow into more turbulent flow. applications of turbulators exist in the field of aerospace. one example is the british handley page victor bomber of cold war vintage, which featured deployable turbulators in front of the bomb bay doors. when the bomb doors were opened, these turbulators would deploy automatically to disrupt the laminar airflow and allow the aircrafts payload to fall freely into the airstream.

https://www.youtube.com/watch?v=dDOzI9uWH9E