A 675 kg car moving at 15.7 m/s hits from behind another car moving at 9.6 m/s in the same direction. If the second car has a mass of 538 kg and a new speed of 13.5 m/s what is the velocity of the first car after the collision?

so easy. just google the electromagnetic waves and it’ll pop up.

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.