An electromagnet is the most powerful type of magnet there is. It is a magnet with a current running through it that can be turned on and off. Why might it be useful to be able to turn the encouragement on and off?
2 answers
An electromagnet can be useful to be able to turn the current on and off because it allows for greater control over the magnetic field. This can be used to attract or repel certain objects, or to control the strength of the magnetic field. It can also be used to create a temporary magnetic field, which can be useful for certain applications.
identify the function rule from the value of the table