n eregnet by undmg 30 tunes of wire over an iron scree. Paheli also made anlagt by anding 200 turns over a similar iron screw. Which electre magnet will 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.