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9 août 2015 · Electromagnets are useful because you can turn the magnet on and off by completing or interrupting the circuit, respectively
There are two main differences between permanent magnets and electromagnets: You can turn electromagnets on and off You can make electromagnets that are much
You can turn an electromagnet on and off by turning the current on and off The magnetic field is only produced when the current is flowing in the wire Using a
Unlike permanent magnets, an electromagnet's magnetism can be turned off by removing the electricity or battery You can make an electromagnet from everyday
the protection will be DESIGNATIONS: initial position, after turning off the power Under demand: we can adapt our products to different
an electromagnet can be switched on and off a permanent magnet cannot be switched off to release a car body • so would not be as useful in the
Their magnetic field can be turned off by removing the electric current II Making an Electromagnet Using Batteries, a Nail and Copper Wire Materials
The magnetic field disappears when the current is turned off How much magnetism is applied can be controlled by increasing or decreasing the electricity
Electromagnets can be turned on or off with electricity An electromagnet is a magnet that uses electricity The strength of an electromagnet can be changed