You can see that even though it isn't touching the magnet, the paperclip is still attracted to it, keeping the paperclip in the air.

magnetic fields? (article) | Khan Academy What are magnetic fields? (article) | Khan Academy

To concentrate the magnetic field, in an electromagnet the wire is wound into a coil with many turns of wire lying side by side.Coils are made with wire with a finite resistance per volume - doubling wire area halves resistance but (in an ideal packing situation) halves the number of turns so halves voltage. Electromagnets are widely used as components of other electrical devices, such as motors, generators, electromechanical solenoids, relays, loudspeakers, hard disks, MRI machines, scientific instruments, and magnetic separation equipment.

Increase strength of magnet (video) | Khan Academy

VersaDrive and ImpactaMag reamers are Tapered reamers, otherwise known as Bridge reamers, and will self centre thanks to their sloping, tapered sides. Magnetic separation equipment, used for separating magnetic from nonmagnetic material, for example separating ferrous metal from other material in scrap. Magnetic forces are non-contact forces close non-contact force Force exerted between two objects, even when they are not touching, such as the force of gravity.This influences the ability to fit a given number of turns within available or desired area and volume. Second, because the magnetic field B and force are nonlinear functions of the current, depending on the nonlinear relation between B and H for the particular core material used. Once the reamer has reached its widest point the cut is complete, and the reamer can be stopped and withdrawn. If magnet thicknesses are made larger compared to winding depths then this zone can extend out into winding space (which is good) but magnet cost rises and it is usually found that overall performance and cost tradeoffs do not have very large magtnet thickness to winding height ratios. For thousands of years people have been able to use the Earth’s magnetic field to find their way around the globe using one of these.

Magnet - 5 answers | Crossword Clues Magnet - 5 answers | Crossword Clues

And when the power is off, the magnetic field disappears, and the metals drop, just like in the recycling centre! The effect of the core is to concentrate the field, and the magnetic field passes through the core more easily than it would pass through air.When an electric current, like the one generated by a power pack, flows through copper wire it creates a magnetic field and we have made… an electromagnet. The magnetic domain theory of how ferromagnetic cores work was first proposed in 1906 by French physicist Pierre-Ernest Weiss, and the detailed modern quantum mechanical theory of ferromagnetism was worked out in the 1920s by Werner Heisenberg, Lev Landau, Felix Bloch and others. It was a desire to provide a solution to these challenges that led us to create two brand new products - Enter the VersaDrive and ImpactaMag range of construction and fabrication reamers. For example, a 12-inch long coil ( ℓ = 12 in) with a long plunger of 1-square inch cross section ( A = 1 in 2) and 11,200 ampere-turns ( N I = 11,200 Aturn) had a maximum pull of 8.