AN ELECTROMAGNET IS MADE STRONGER BY WRAPPING MORE COILS ROUND IT
WRONG!!
Although you would have more strength with 2 or 3 coils, this means that you have 2 or 3 electromagnets.
Instead of saying "more coils" you should say "MORE TURNS on the COIL" since there is only one coil for one electromagnet. THEN the strengthnof the electromagnet would be stronger (assuming that the length of wire remains the same)
This may seem pedantic but physics is a precise subject and writing the wrong one of the above will GUARANTEE to lose you a mark in a physics exam!