A 29000 lb engine is pulling two freight cars up a 1.3 % incline. The weight of the first freight car is 29000 lbs, and the weight of the second freight car is 10500 lbs. The train is accelerating at 0.33 ft/s2 as it goes up the hill.

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.