Cuales fueron las aportaciones de Copérnico por favor ayuda

the answer is a. hope this .

i think the answer is a, hope this : )

what is the actual question though?

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.