Electromagnet

Solenoid: - A coil of wire with a current. - A solenoid with a ferromagnetic core is called an electromagnet.   Several ways to increase the strength of a solenoid: 1) Increase the current in the solenoid 2) add more loops of wire in the solenoid 3) wind the coils of the solenoid close together 4) increase the strength by increasing the ferromagnetic material of the core ﻿﻿ What are electromagnets?  - An electromagnet is a solenoid with a ferromagnetic core. Its magnetic field is produced by current in the wire and magnetized core. - Electromagnetism is the relationship between electricity and magnetism. - It is a strong magnet that can be turned on and off  <span style="font-family: Arial,Helvetica,sans-serif;">Why are they important? <span style="font-family: Arial,Helvetica,sans-serif;"> <span style="font-family: Arial,Helvetica,sans-serif;">- They are important, because we use them in our everyday lives, and because they only work, when we need it. The magnet is temporary; it works when there is current, only. <span style="font-family: Arial,Helvetica,sans-serif;">- They are also extremely important in the medical industry,they are used in cat scanners and for removing objects from peoples eyes. <span style="font-family: Arial,Helvetica,sans-serif;"> <span style="font-family: Arial,Helvetica,sans-serif;">Examples of electromagnets jin our daily lifes: <span style="font-family: Arial,Helvetica,sans-serif;"> <span style="font-family: Arial,Helvetica,sans-serif;">-Their are many devices that use electromagnets. For example, they are used in door bells, locks, tape recoreders, and trains that do not have wheels, cars. <span style="font-family: Arial,Helvetica,sans-serif;">-Loudspeakers and earphones use the electromagnets to drive the diaphragm. <span style="font-family: Arial,Helvetica,sans-serif;"> <span style="font-family: Arial,Helvetica,sans-serif;">Properties that make and electromagnet are: <span style="font-family: Arial,Helvetica,sans-serif;"> <span style="font-family: Arial,Helvetica,sans-serif;">-The strength of a magnet can be increased by the current in the coil and by a soft iron core inside coil <span style="font-family: Arial,Helvetica,sans-serif;">- Strong temporary magnets <span style="font-family: Arial,Helvetica,sans-serif;">- As soon as the current is switched off, they are no longer magnets <span style="font-family: Arial,Helvetica,sans-serif;">- can be made intro different form and sizes accoding to the needs.