Your go cart breaks down right before the end of a race so you have to push it over the finish line the go cart has a mass of 85 kg

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.