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How can an electromagnet raise the barrier?

An electromagnet can raise a barrier by generating a magnetic field when an electric current flows through it. When the magnet is activated, it pulls a metal armature attached to the barrier, lifting it up against the force of gravity. The strength of the electromagnet determines its lifting capacity.


What can you do with an electromagnet that you cannot do with a permanent magnet?

You can control the strength of an electromagnet by adjusting the current flowing through it, which is not possible with a permanent magnet. Additionally, you can turn the electromagnet on and off by controlling the electric current, allowing for greater flexibility in applications such as lifting objects or generating magnetic fields.


What type of magnet can vary its strength and polarity?

electromagnet


What kind of magnet can vary its strength polarity?

an electromagnet


What is better for lifting heavy metal objects eletromagnet or permanet magnet?

An electromagnet would generally be better for lifting heavy metal objects as its magnetic strength can be easily controlled by adjusting the electrical current. A permanent magnet may not have sufficient magnetic strength to lift heavy objects, and it does not offer the flexibility of adjusting its magnetic force.


How is a electromagnet diffrent then a permanent magnet?

An electromagnet is a temporary magnet that only produces a magnetic field when an electric current is flowing through it, while a permanent magnet retains its magnetism without needing an external electric current. Additionally, the strength of an electromagnet can be easily adjusted by changing the amount of current flowing through it, while the strength of a permanent magnet is fixed.


What is a lifting magnet?

A lifting magnet is an electromagnet that is meant to hold or move material that comes in contact with the magnet. This is the opposite of a traction magnet.


What kind of magnet has its strength and poles set by the manufacturer?

electromagnet


Can an electromagnet lift metal at a water depth of 300 feet?

The magnet on the surface and the metal 300 ft down - no. Lowering the magnet to the metal, then lifting - yes.


What controls the strength of a magnet made with electric current?

The strength of a magnet(electromagnet) made by flowing electric current through a conducting coil depends on magnitude of current. . .


Would increasing the length of a rod in an electromagnet increase it's magnetism?

No, as in this case,the rod is the magnet,and the strength of a magnet does not depend on its size.


What does a electromagnet have that a bar magnet does not have?

The bar magnet and the electromagnet act identical. The difference being a electromagnet is a coil of wire that has a power source connect to both ends, this energizes the coil with an electromagnetic field.