# Electromagnets

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When an electric current flows through a wire, a magnetic field can be produced. When electricity creates a magnetic field, it is called electromagnetism.An electromagnet is considered a temporary magnet because if the current of electricity stops its flow, there will no longer be a magnetic field. The magnetic field of a temporary magnet can be turned on and off by using a switch. The size of an electromagnet’s magnetic field and magnetism is not the same. There are several variables involved that affect the magnetic field and its strength. The variables include the amount of voltage used, size of the core, the number of wire coils, the number of turns of the wire coil, and the space between the wire coils as they are wrapped around the core.

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### Help

##### Remember :

The smallest number is the one that comes first while counting.

##### Solution :

To arrange the given numbers in order from smallest to greatest, find the smallest number among all the given numbers.

21,27,23

21 is the smallest number.