Which of the following best describes a cause of wind? (points : 3) conduction of heat from earth's surface to the upper atmosphere earth's spin on its axis movement of air due to temperature differences movement of air due to different changes is water vapor content

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.