you need
  • - electrical steel cylinder;
  • - Tester;
  • - current source;
  • - copper wire.
on the workpiece electrical steel cylindrical shape copper wire wound in the insulating sheath.Use a wire diameter of about 1 mm.It has sufficient conductivity and allows a large number of turns wound on a core that will enhance magnetic fi eld.It will be an electric coil magnet well.To enhance the effect, you can take a horseshoe-shaped workpiece.
Assemble the electric circuit of series-connected power source, winding electro magnet a store and resistors or a rheostat for adjusting the current in the circuit.Use the DC power source to the electromotive force of up to 24 volts.If you can adjust the voltage directly to the power source, the resistor in the
circuit is not included.For controlling the current in a circuit using a tester.Turn it in series with the electro magnet th.
Set the source or resistor so that the voltage is minimal.Then the electric current in the coil magnet and will have a safe value.Slowly begin to increase the voltage.The current through the coil electro magnet and will begin to grow in proportion.For copper wire with a diameter of 1 mm maximum safe current is 6 amps.If the current exceeds this value, the winding electro magnet and burns.
When current flows through the coil, the core will become a magnet .Lift thereto body of iron or an alloy (steel, cast iron, etc.).He will draw the subject to the base of the cylinder electrical steel (nickle magnet a).If the force of gravity is low, increase the number of turns per coil electro magnet well.For this wound on the wire of greater length.At the same time, keep in mind that the resistance will increase in proportion to the length.When you reconnect electrical magnet and bring the value of the current to the nominal value.After switching off the electric current magnetic properties of the core will be lost.