Which of the following will be attracted to the north pole of a magnet? a. the south pole of another magnet. b. the north pole of another magnet. c. a piece of plastic. d. a piece of rubber.

i think it will be A because it has to be the opposite sides to attract

the answer is the first electromagnet (a). this is because it has more coils around the ferromagnetic material. increasing the number of coils increases the surface area in which the metal interacts with the current in the coil. this enables more atoms in the metal to become aligned hence becoming more magnetized.