That applied force increases the momentum that is carried in the currents induced by the magnet. If they were both free falling then technically it would be the same as them being stationary. I'm asking if the magnet exciting the pipe is similar to interrupting dc current.
The changing magnetic field of a falling magnet induces currents in the pipe that slows it's fall through the pipe.
Question:
If the induced currents are decreasing the magnets descent then they must themselves have momentum. How is it dissipated once the magnet has passed through the end of...
I've come to assume the difference in atomic radiuses is the cause . That and it seems nickel is rather immobile, even in copper alloys. Also I thought higher valency metals tend to dissolve in the lower valency metal.
Hume–Rothery rules seem to be moderately satisfied for nickel to readily dissolve in silver. Silver has a radius of 144, valence of 1 and an electronegativity of 1.93. Nickel has a radius of 124, valence of 2 and an electronegativity of 1.91. Both elements have a fcc crystal structure. I read...
I think the current is running parallel to the axis before the lorentz force produces a spiral path in the current flow. I used a N45 and N52 neodymium magnet and got zero results. Then I used a coil of 150 turns instead of the magnet and tried a 10khz frequency to try and detect something. I...
I setup an experiment to detect a magnetic field due to the Lorentz force acting on a current. It is a hollow conducting cylinder with a magnet at one end. With current flowing in the cylinder I approach the negative end with the north pole of the magnet. Using the left hand rule I expected the...
I know the magnetic flux inside a hollow conductor is zero. Is this also true if the observer is inside the conductor and the conductor is rotating in relation to the observer so that the electrons are traveling in spirals around the hollow center?
When I asked the original question I assumed I understood the effect of a magnet moving towards a conductor. Now I'm not so sure. I always thought that the field lines can only be used when also identifying the direction the magnetic field is growing. In the diagram Phyzguy made; the down arrows...
If this is correct the outer current loops would accelerate the magnet towards the sheet of copper. Actually, no force would act on the magnet because the magnetic fields of the induced currents would cancel. We can use the right hand rule to find the direction of current flow. The flux lines...
Thank you all for your responses. I have a few things I want to address.
My reasoning for the copper plate to rotate is because the currents induced in the plate are encountering resistance as they move in concentric circles. If the copper heats up due to joule heating; why wouldn't it also...
In the situation of a magnet moving towards a flat sheet of copper; why doesn't the copper gain angular moment as the electrons move in concetric circles? The electrons are experiencing friction as they move through the copper.
I've seen examples of each of these types of dc motors. What I haven't found is a dc motor that doesn't use pwm, commutators/brushes, or some sort of slip contact. Is there a such thing? If not, would there be a demand for such a motor?
Didn't intend to put words in your mouth. I simply thought that was what you were implying when you made these two statements:
Rather, "ballistic tunneling" is synonymous with "elastic tunneling", whereby the tunneling particle does not change its energy as it tunnels through the barrier.
This...
Zapperz, if the electron is not interacting with the dielectric, consider the following situation:
Two concentric conducting cylinders are separated by a very thin dielectric. The outer conducting cylinder is insulated from ground. If the central conductor is charged with a continuous supply...