A car accelerates from 12 m / s to 20 m / s in 6.4 s. If the mass of the car is 1200 kg, how much force should you be exerted by the engine?

force tends to be low and long diustance masses are high

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.