Magnet Definition and 912 Threads

i am to design an experiment showing how magnetic field strength of a magnet varies with its temperature. i know i can use a hall probe to measure the field strength - but how do i vary the temperature, and ensure that this is uniform throughout the magnet?

newbie here - i know this question is tangled up with the question, "what is a field?" and "how does a field work?", but to keep it simple (ha!) can someone please try to explain how a magnet works? ie, how is force transmitted from the magnet to its surroundings? does a magnet "do work"...

I can't get it imy head why are electrons set in motion in magnet fild - that changes, or why do they move in not strait motion in stady magnetic fild. I know about Lorentz force, but i don't know why, and why that specific direction? I've tryed to correlate it to electrons magnetic fild...

Let’s say I make ball (sphere) out of permanent magnet material. Where will be N/S poles, will they take fixed position or, as I think, position won't be fixed. p.s. same for magnet ring

Hi, I have a submerged magnetic water pump that is pushing too much water at 8500L/hr. I know that the propeller rpm depends on the frequency of the AC supply but how can I build a simple circuit to reduce the frequency? Thanks :smile:

If I have an internal resistance of the motor and the value of flux and the generator constant, can I simulate the system's performance by a circuit with two circuits in series, one being the internal resistance, and the other being the load, and the voltage source being the armature voltage?

In order to induce a voltage in a coil, is a magnet reqired to pass through the middle of the windings? So the real question is, if I have a tube-like or sleeve-like magnet, can I pass the windings throught the inside of the magnet and still induce a current? Are both ways essentially the...

What is the most efficient way to build a permanent magnet linear generator--AC or DC, it makes no difference. I'm working on a personal project but don't know where to start. I'm assuming that a generator similar to the one inside of a ForeverFlashlight is probably the best way to go, but I'm...

[SOLVED] Rotating Magnet I had forgotten about a web page I made several months ago. It's regarding a rotating magnet. There are some cool physics in this page so take a look www.geocities.com/physics_world/em/rotating_magnet.htm Back in the early 60's Edward Purcell came out with an idea...

I'm trying to build a small cyclotron and am thus searching for a magnet. I've been looking for a neodythium disc magnet that I could have cut in half to act as the two 'D' magnets in the cyclotron. The size of the magnet needs be somewhere around 12" in diameter but I can't seem to find...

[SOLVED] Refrigerator Magnet?? A magnet is suppose to have two poles the north and south, it is said that you can't ever have a magnet with only one pole. So how do refrigerator magnets work if they only have one side?? Thanks, Daniel

vortex ionisation Could you sustain a vortex in a vessel of water by ionising the water with high voltage ? Thanks, hope this question makes sense.