Your teacher has shown you the following activity.

Activity: Teacher has wound a long insulated piece of wire around an iron nail in the form of a coil. Free ends of the wire are connected to a cell through a switch as shown in the figure. The current is switched on and some pins are placed near the ends of the nail.
Write down any three questions that come to your mind about this activity."

Some of the questions can be
$(i)$. Why does the nail attract the pins?
$(ii)$. What will happen if we connect more cells in the circuit?
$(iii)$. What will happen if we use some other material like a straw in place of the nail?
$(iv)$. What will happen if we wrap the wire on the nail more tightly?

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