How can this principle be utilized to make on electromagnet?

1.	How can this principle be utilized to make on electromagnet?
Answer» All you need to do is wrap a insulated copper wire around a iron nail. then connect the wire to terminals of battery. when current flows through the wire the iron nail will get magnetised and will become a electromagnet.You can increase the strength of magnetic field of electromagnet by ;1. by increasing the strength of current.2. by increasing the number of turns of wire.

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