I have science day project in school i have to make a model plz suggest me a model in which we can reuse energy in the form of electromagnetism in car

Solution,
You can make a solenoid and use it in a car as a magnetic compass . As a solenoid when freely suspended , rest in North -south direction. So from this you can depict the various cardinal directions. Take an iron rod and wind it with the copper wire and connect the rod to a battery with the help of a key. When the circuit is completed by tapping the key, the current flows in the solenoid and it behaves like an electromagnet.

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