EARTH SCIENCE
MAGNETISM
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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An electromagnet is smaller and less powerful.
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An electromagnet’s magnetism can be turned off.
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An electromagnet can be built without using metal.
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An electromagnet does not attract objects containing iron.
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Detailed explanation-1: -The major difference between an electromagnet and a permanent magnet is that the former can have a magnetic field when electric current flows through it and disappears when the flow of the current stops.
Detailed explanation-2: -When it is connected to an electric current, an electromagnet has a magnetic field. Then it can push or pull some metal objects. It can be turned off by disconnecting it from the electricity.
Detailed explanation-3: -A permanent magnet is an object made of a material that gets magnetized and creates its own persistent magnetic field. An electromagnet is made from a coil of wire that acts as a magnet when an electric current is allowed to pass through it.
Detailed explanation-4: -Generally, no. The neodymium magnets we provide are also called, “permanent magnets.” The word “permanent” means they stay magnetized for a long time. They are always on. This is the opposite of an electromagnet, where you have to run an electric current through a wire whenever you want it to act like a magnet.
Detailed explanation-5: -An electromagnet loses its magnetism when the current flowing through its coil is stopped.