Magnetic field is created by moving electric charge. Therefore to create it, connect the conductor to a source of electric current - around it magnetic field will appear. Check its existence a magnetic needle which will orient on power lines. Also for obtaining magnetic field it is possible to use a permanent magnet. Powerful magnetic fields are generated by electromagnets.
It is required to you
- the conductor, magnetic needle, permanent magnet, the coil with the core.
Instruction
1. Creation of magnetic field you tokavozmit the conductor and connect it to a current source, watching that the conductor did not overheat. Bring to it a thin magnetic needle which can freely rotate. Establishing it in different points of space around the conductor, make sure that she is guided on power lines of magnetic field.
2. Magnetic field constant you magnitavozmit a permanent magnet and bring it to any subject containing a large amount of iron. At once there will be magnetic force attracting a magnet and an iron body - it is the main proof of existence of magnetic field. Put a permanent magnet on the sheet of paper and strew around it with small iron shaving. After a while on the sheet of paper there will be a drawing illustrating existence of power lines of magnetic field. They are called by lines of magnetic induction.
3. An elektromagnitakatushka with the isolated wire attach creation of magnetic field to a source of electric current through a rheostat. To avoid burn-out of a wire, establish a rheostat on the maximum resistance. Place a magnetic conductor in the coil. It can be a piece of soft iron or steel. If it is supposed to receive powerful magnetic field, the iron core (magnetic conductor) needs to be gathered from the plates isolated among themselves to avoid emergence of currents of Foucault which will interfere with generation of magnetic field. Having connected a chain to a current source, begin to move slowly the slider of a rheostat, watching that the winding of the coil did not overheat. At the same time the magnetic conductor will turn into the powerful magnet capable to attract and hold massive iron objects.