“Two forces are applied to a 2 kg mass on a flat, frictionless surface, as shown in the diagram. What is the acceleration on the mass?” A) 2.5 m/s to the left
B) 2.5 m/s to the right
C) 10 m/s to the left
D) 10 m/s to the right

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.